feat: support Node 6 (#9)

.babelrc

@@ -0,0 +1,13 @@
+{
+  "presets": [
+    ["env", {"targets": {"node": "6"}}]
+  ],
+  "plugins": [
+    "transform-object-rest-spread"
+  ],
+  "env": {
+    "test": {
+      "plugins": ["istanbul"]
+    }
+  }
+}

.gitignore

@@ -60,3 +60,6 @@ typings/
 
 # @std/esm
 .esm-cache
+
+# build directory
+/lib/

.travis.yml

@@ -1,10 +1,15 @@
 language: node_js
 
+node_js:
+  - 8
+  - 6
+
 cache:
   directories:
     - node_modules
 
 script:
+  - npm run build
   - npm run lint
   - npm test
   - npm run test:coverage
@@ -13,8 +18,10 @@ deploy:
   provider: npm
   email: ybiquitous@gmail.com
   api_key: $NPM_TOKEN
+  skip_cleanup: true
   on:
     tags: true
+    node: 6
 
 notifications:
   email: false

bin/cli.js

@@ -1,3 +1,3 @@
 #!/usr/bin/env node
 
-require('../src/cli')()
+require('../lib/cli')()