refactor: move dependency to peerDependencies

BREAKING CHANGE:
`esm` need to be installed manually for cli usage

package.json

@@ -29,13 +29,15 @@
   },
   "homepage": "https://github.com/ekoeryanto/vuepress-plugin-sitemap#readme",
   "dependencies": {
-    "chalk": "^2.4.1",
-    "commander": "^2.19.0",
-    "esm": "^3.0.84",
     "sitemap": "^2.0.1"
   },
   "devDependencies": {
     "conventional-changelog-cli": "^2.0.5",
     "release-it": "^7.6.2"
+  },
+  "peerDependencies": {
+    "chalk": "^2.0.0",
+    "commander": "^2.0.0",
+    "esm": "^3.0.0"
   }
 }

yarn.lock

@@ -842,7 +842,7 @@ capture-stack-trace@^1.0.0:
   resolved "https://registry.yarnpkg.com/capture-stack-trace/-/capture-stack-trace-1.0.1.tgz#a6c0bbe1f38f3aa0b92238ecb6ff42c344d4135d"
   integrity sha512-mYQLZnx5Qt1JgB1WEiMCf2647plpGeQ2NMR/5L0HNZzGQo4fuSPnK+wjfPnKZV0aiJDgzmWqqkV/g7JD+DW0qw==
 
-chalk@2.4.1, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.3.1, chalk@^2.4.1:
+chalk@2.4.1, chalk@^2.0.0, chalk@^2.0.1, chalk@^2.3.1:
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.4.1.tgz#18c49ab16a037b6eb0152cc83e3471338215b66e"
   integrity sha512-ObN6h1v2fTJSmUXoS3nMQ92LbDK9be4TV+6G+omQlGJFdcUX5heKi1LZ1YnRMIgwTLEj3E24bT6tYni50rlCfQ==
@@ -936,11 +936,6 @@ color-name@1.1.3:
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
   integrity sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=
 
-commander@^2.19.0:
-  version "2.19.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.19.0.tgz#f6198aa84e5b83c46054b94ddedbfed5ee9ff12a"
-  integrity sha512-6tvAOO+D6OENvRAh524Dh9jcfKTYDQAqvqezbCW82xj5X0pSrcpxtvRKHLG0yBY6SD7PSDrJaj+0AiOcKVd1Xg==
-
 commander@~2.17.1:
   version "2.17.1"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.17.1.tgz#bd77ab7de6de94205ceacc72f1716d29f20a77bf"
@@ -1392,11 +1387,6 @@ escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
   integrity sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=
 
-esm@^3.0.84:
-  version "3.0.84"
-  resolved "https://registry.yarnpkg.com/esm/-/esm-3.0.84.tgz#bb108989f4673b32d4f62406869c28eed3815a63"
-  integrity sha512-SzSGoZc17S7P+12R9cg21Bdb7eybX25RnIeRZ80xZs+VZ3kdQKzqTp2k4hZJjR7p9l0186TTXSgrxzlMDBktlw==
-
 esutils@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"