diff --git a/Pipfile b/Pipfile
index ac418ee..6a5434d 100644
--- a/Pipfile
+++ b/Pipfile
@@ -17,6 +17,7 @@ u-msgpack-python = "*"
 sphinx-rtd-theme = "*"
 sphinx = "*"
 bumpversion = "*"
+twine = "*"
 
 [requires]
 python_version = "3.6"
diff --git a/Pipfile.lock b/Pipfile.lock
index 413df48..3fee440 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "3e044f50adc0f217546ff3b5c8361e3be9077ccc1027e0b61f40cd89ef36822b"
+            "sha256": "2715c9397af105cc57bb30287a56acac9649eea9d520fd3ea2b3c2d18a058988"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -86,10 +86,10 @@
         },
         "filelock": {
             "hashes": [
-                "sha256:86fe6af56ae08ebc9c66d54ba3398c35b98916d0862d782b276a65816ff39392",
-                "sha256:97694f181bdf58f213cca0a7cb556dc7bf90e2f8eb9aa3151260adac56701afb"
+                "sha256:b8d5ca5ca1c815e1574aee746650ea7301de63d87935b3463d26368b76e31633",
+                "sha256:d610c1bb404daf85976d7a82eb2ada120f04671007266b708606565dd03b5be6"
             ],
-            "version": "==3.0.9"
+            "version": "==3.0.10"
         },
         "idna": {
             "hashes": [
@@ -128,10 +128,10 @@
         },
         "requests": {
             "hashes": [
-                "sha256:99dcfdaaeb17caf6e526f32b6a7b780461512ab3f1d992187801694cba42770c",
-                "sha256:a84b8c9ab6239b578f22d1c21d51b696dcfe004032bb80ea832398d6909d7279"
+                "sha256:65b3a120e4329e33c9889db89c80976c5272f56ea92d3e74da8a463992e3ff54",
+                "sha256:ea881206e59f41dbd0bd445437d792e43906703fff75ca8ff43ccdb11f33f263"
             ],
-            "version": "==2.20.0"
+            "version": "==2.20.1"
         },
         "six": {
             "hashes": [
@@ -157,11 +157,11 @@
         },
         "tox": {
             "hashes": [
-                "sha256:217fb84aecf9792a98f93f07cfcaf014205a76c64e52bd7c2b4135458e6ad2a1",
-                "sha256:4baeb3d8ebdcd9f43afce38aa67d06f1165a87d221d5bb21e8b39a0d4880c134"
+                "sha256:513e32fdf2f9e2d583c2f248f47ba9886428c949f068ac54a0469cac55df5862",
+                "sha256:75fa30e8329b41b664585f5fb837e23ce1d7e6fa1f7811f2be571c990f9d911b"
             ],
             "index": "pypi",
-            "version": "==3.5.2"
+            "version": "==3.5.3"
         },
         "traceback2": {
             "hashes": [
@@ -180,17 +180,17 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:41c3db2fc01e5b907288010dec72f9d0a74e37d6994e6eb56849f59fea2265ae",
-                "sha256:8819bba37a02d143296a4d032373c4dd4aca11f6d4c9973335ca75f9c8475f59"
+                "sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39",
+                "sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22"
             ],
-            "version": "==1.24"
+            "version": "==1.24.1"
         },
         "virtualenv": {
             "hashes": [
-                "sha256:2ce32cd126117ce2c539f0134eb89de91a8413a29baac49cbab3eb50e2026669",
-                "sha256:ca07b4c0b54e14a91af9f34d0919790b016923d157afda5efdde55c96718f752"
+                "sha256:686176c23a538ecc56d27ed9d5217abd34644823d6391cbeb232f42bf722baad",
+                "sha256:f899fafcd92e1150f40c8215328be38ff24b519cd95357fa6e78e006c7638208"
             ],
-            "version": "==16.0.0"
+            "version": "==16.1.0"
         },
         "wheel": {
             "hashes": [
@@ -222,6 +222,13 @@
             ],
             "version": "==2.6.0"
         },
+        "bleach": {
+            "hashes": [
+                "sha256:48d39675b80a75f6d1c3bdbffec791cf0bbbab665cf01e20da701c77de278718",
+                "sha256:73d26f018af5d5adcdabf5c1c974add4361a9c76af215fe32fdec8a6fc5fb9b9"
+            ],
+            "version": "==3.0.2"
+        },
         "bumpversion": {
             "hashes": [
                 "sha256:6744c873dd7aafc24453d8b6a1a0d6d109faf63cd0cd19cb78fd46e74932c77e",
@@ -275,9 +282,36 @@
         },
         "markupsafe": {
             "hashes": [
-                "sha256:a6be69091dac236ea9c6bc7d012beab42010fa914c459791d627dad4910eb665"
+                "sha256:048ef924c1623740e70204aa7143ec592504045ae4429b59c30054cb31e3c432",
+                "sha256:130f844e7f5bdd8e9f3f42e7102ef1d49b2e6fdf0d7526df3f87281a532d8c8b",
+                "sha256:19f637c2ac5ae9da8bfd98cef74d64b7e1bb8a63038a3505cd182c3fac5eb4d9",
+                "sha256:1b8a7a87ad1b92bd887568ce54b23565f3fd7018c4180136e1cf412b405a47af",
+                "sha256:1c25694ca680b6919de53a4bb3bdd0602beafc63ff001fea2f2fc16ec3a11834",
+                "sha256:1f19ef5d3908110e1e891deefb5586aae1b49a7440db952454b4e281b41620cd",
+                "sha256:1fa6058938190ebe8290e5cae6c351e14e7bb44505c4a7624555ce57fbbeba0d",
+                "sha256:31cbb1359e8c25f9f48e156e59e2eaad51cd5242c05ed18a8de6dbe85184e4b7",
+                "sha256:3e835d8841ae7863f64e40e19477f7eb398674da6a47f09871673742531e6f4b",
+                "sha256:4e97332c9ce444b0c2c38dd22ddc61c743eb208d916e4265a2a3b575bdccb1d3",
+                "sha256:525396ee324ee2da82919f2ee9c9e73b012f23e7640131dd1b53a90206a0f09c",
+                "sha256:52b07fbc32032c21ad4ab060fec137b76eb804c4b9a1c7c7dc562549306afad2",
+                "sha256:52ccb45e77a1085ec5461cde794e1aa037df79f473cbc69b974e73940655c8d7",
+                "sha256:5c3fbebd7de20ce93103cb3183b47671f2885307df4a17a0ad56a1dd51273d36",
+                "sha256:5e5851969aea17660e55f6a3be00037a25b96a9b44d2083651812c99d53b14d1",
+                "sha256:5edfa27b2d3eefa2210fb2f5d539fbed81722b49f083b2c6566455eb7422fd7e",
+                "sha256:7d263e5770efddf465a9e31b78362d84d015cc894ca2c131901a4445eaa61ee1",
+                "sha256:83381342bfc22b3c8c06f2dd93a505413888694302de25add756254beee8449c",
+                "sha256:857eebb2c1dc60e4219ec8e98dfa19553dae33608237e107db9c6078b1167856",
+                "sha256:98e439297f78fca3a6169fd330fbe88d78b3bb72f967ad9961bcac0d7fdd1550",
+                "sha256:bf54103892a83c64db58125b3f2a43df6d2cb2d28889f14c78519394feb41492",
+                "sha256:d9ac82be533394d341b41d78aca7ed0e0f4ba5a2231602e2f05aa87f25c51672",
+                "sha256:e982fe07ede9fada6ff6705af70514a52beb1b2c3d25d4e873e82114cf3c5401",
+                "sha256:edce2ea7f3dfc981c4ddc97add8a61381d9642dc3273737e756517cc03e84dd6",
+                "sha256:efdc45ef1afc238db84cb4963aa689c0408912a0239b0721cb172b4016eb31d6",
+                "sha256:f137c02498f8b935892d5c0172560d7ab54bc45039de8805075e19079c639a9c",
+                "sha256:f82e347a72f955b7017a39708a3667f106e6ad4d10b25f237396a7115d8ed5fd",
+                "sha256:fb7c206e01ad85ce57feeaaa0bf784b97fa3cad0d4a5737bc5295785f5c613a1"
             ],
-            "version": "==1.0"
+            "version": "==1.1.0"
         },
         "packaging": {
             "hashes": [
@@ -292,6 +326,13 @@
             ],
             "version": "==0.1.2"
         },
+        "pkginfo": {
+            "hashes": [
+                "sha256:5878d542a4b3f237e359926384f1dde4e099c9f5525d236b1840cf704fa8d474",
+                "sha256:a39076cb3eb34c333a0dd390b568e9e1e881c7bf2cc0aee12120636816f55aee"
+            ],
+            "version": "==1.4.2"
+        },
         "pygments": {
             "hashes": [
                 "sha256:78f3f434bcc5d6ee09020f92ba487f95ba50f1e3ef83ae96b9d5ffa1bab25c5d",
@@ -301,17 +342,17 @@
         },
         "pyparsing": {
             "hashes": [
-                "sha256:bc6c7146b91af3f567cf6daeaec360bc07d45ffec4cf5353f4d7a208ce7ca30a",
-                "sha256:d29593d8ebe7b57d6967b62494f8c72b03ac0262b1eed63826c6f788b3606401"
+                "sha256:40856e74d4987de5d01761a22d1621ae1c7f8774585acae358aa5c5936c6c90b",
+                "sha256:f353aab21fd474459d97b709e527b5571314ee5f067441dc9f88e33eecd96592"
             ],
-            "version": "==2.2.2"
+            "version": "==2.3.0"
         },
         "pytz": {
             "hashes": [
-                "sha256:642253af8eae734d1509fc6ac9c1aee5e5b69d76392660889979b9870610a46b",
-                "sha256:91e3ccf2c344ffaa6defba1ce7f38f97026943f675b7703f44789768e4cb0ece"
+                "sha256:31cb35c89bd7d333cd32c5f278fca91b523b0834369e757f4c5641ea252236ca",
+                "sha256:8e0f8568c118d3077b46be7d654cc8167fa916092e28320cde048e54bfc9f1e6"
             ],
-            "version": "==2018.6"
+            "version": "==2018.7"
         },
         "pyyaml": {
             "hashes": [
@@ -329,12 +370,26 @@
             ],
             "version": "==3.13"
         },
+        "readme-renderer": {
+            "hashes": [
+                "sha256:bb16f55b259f27f75f640acf5e00cf897845a8b3e4731b5c1a436e4b8529202f",
+                "sha256:c8532b79afc0375a85f10433eca157d6b50f7d6990f337fa498c96cd4bfc203d"
+            ],
+            "version": "==24.0"
+        },
         "requests": {
             "hashes": [
-                "sha256:99dcfdaaeb17caf6e526f32b6a7b780461512ab3f1d992187801694cba42770c",
-                "sha256:a84b8c9ab6239b578f22d1c21d51b696dcfe004032bb80ea832398d6909d7279"
+                "sha256:65b3a120e4329e33c9889db89c80976c5272f56ea92d3e74da8a463992e3ff54",
+                "sha256:ea881206e59f41dbd0bd445437d792e43906703fff75ca8ff43ccdb11f33f263"
+            ],
+            "version": "==2.20.1"
+        },
+        "requests-toolbelt": {
+            "hashes": [
+                "sha256:42c9c170abc2cacb78b8ab23ac957945c7716249206f90874651971a4acff237",
+                "sha256:f6a531936c6fa4c6cfce1b9c10d5c4f498d16528d2a54a22ca00011205a187b5"
             ],
-            "version": "==2.20.0"
+            "version": "==0.8.0"
         },
         "six": {
             "hashes": [
@@ -352,11 +407,11 @@
         },
         "sphinx": {
             "hashes": [
-                "sha256:652eb8c566f18823a022bb4b6dbc868d366df332a11a0226b5bc3a798a479f17",
-                "sha256:d222626d8356de702431e813a05c68a35967e3d66c6cd1c2c89539bb179a7464"
+                "sha256:120732cbddb1b2364471c3d9f8bfd4b0c5b550862f99a65736c77f970b142aea",
+                "sha256:b348790776490894e0424101af9c8413f2a86831524bd55c5f379d3e3e12ca64"
             ],
             "index": "pypi",
-            "version": "==1.8.1"
+            "version": "==1.8.2"
         },
         "sphinx-rtd-theme": {
             "hashes": [
@@ -373,6 +428,21 @@
             ],
             "version": "==1.1.0"
         },
+        "tqdm": {
+            "hashes": [
+                "sha256:3c4d4a5a41ef162dd61f1edb86b0e1c7859054ab656b2e7c7b77e7fbf6d9f392",
+                "sha256:5b4d5549984503050883bc126280b386f5f4ca87e6c023c5d015655ad75bdebb"
+            ],
+            "version": "==4.28.1"
+        },
+        "twine": {
+            "hashes": [
+                "sha256:7d89bc6acafb31d124e6e5b295ef26ac77030bf098960c2a4c4e058335827c5c",
+                "sha256:fad6f1251195f7ddd1460cb76d6ea106c93adb4e56c41e0da79658e56e547d2c"
+            ],
+            "index": "pypi",
+            "version": "==1.12.1"
+        },
         "u-msgpack-python": {
             "hashes": [
                 "sha256:1715234fb5bea0f1c2da368b956f85bd64ad565fcb092ac5e20386452ff0b147",
@@ -383,10 +453,10 @@
         },
         "urllib3": {
             "hashes": [
-                "sha256:41c3db2fc01e5b907288010dec72f9d0a74e37d6994e6eb56849f59fea2265ae",
-                "sha256:8819bba37a02d143296a4d032373c4dd4aca11f6d4c9973335ca75f9c8475f59"
+                "sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39",
+                "sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22"
             ],
-            "version": "==1.24"
+            "version": "==1.24.1"
         },
         "watchdog": {
             "hashes": [
@@ -394,6 +464,13 @@
             ],
             "index": "pypi",
             "version": "==0.9.0"
+        },
+        "webencodings": {
+            "hashes": [
+                "sha256:a0af1213f3c2226497a97e2b3aa01a7e4bee4f403f95be16fc9acd2947514a78",
+                "sha256:b36a1c245f2d304965eb4e0a82848379241dc04b865afcc4aab16748587e1923"
+            ],
+            "version": "==0.5.1"
         }
     }
 }
diff --git a/tests/testconfigreader.py b/tests/testconfigreader.py
index b98f3f7..97a5542 100644
--- a/tests/testconfigreader.py
+++ b/tests/testconfigreader.py
@@ -835,7 +835,7 @@ def test_returns_false_if_environment_not_loaded_by_default_linux(self):
                 compare(config.get('home'), os.environ['HOME'])
 
             with self.subTest(1):
-                compare(config.get('host', default='$HOST'), os.environ['HOST'])
+                compare(config.get('shell', default='$SHELL'), os.environ['SHELL'])
 
     @unittest.skipIf(os.name != 'nt', 'Testing environment variables for Windows')
     def test_returns_false_if_environment_not_loaded_by_default_windows(self):