Add prepare script and precommit linting

.eslintrc

@@ -3,8 +3,11 @@
     "rules": {
         "indent": [ 2, "tab", { "SwitchCase": 1 } ],
         "semi": [ 2, "always" ],
+        "quotes": [ 2, "single" ],
+        "linebreak-style": [ 2, "unix" ],
         "keyword-spacing": [ 2, { "before": true, "after": true } ],
         "space-before-blocks": [ 2, "always" ],
+        "space-before-function-paren": [ 2, "always" ],
         "no-mixed-spaces-and-tabs": [ 2, "smart-tabs" ],
         "no-cond-assign": 0,
         "no-unused-vars": 2,

.lintstagedrc

@@ -0,0 +1,10 @@
+{
+  "src/**/*.js": [
+    "eslint --fix",
+    "git add"
+  ],
+  "test/test.js": [
+    "eslint --fix",
+    "git add"
+  ]
+}

.travis.yml

@@ -1,4 +1,13 @@
+sudo: false
 language: node_js
 node_js:
-  - "4.0"
-  - "stable"
+  - "4"
+  - "6"
+  - "8"
+  - "10"
+env:
+  global:
+    - BUILD_TIMEOUT=10000
+install: npm install --ignore-scripts
+before_install:
+  - if [[ $TRAVIS_NODE_VERSION -lt 7 ]]; then npm install --global npm@4; fi