[setup] update travis and add appveyor

.travis.yml

@@ -1,4 +1,9 @@
 language: node_js
+before_script:
+  - npm install eslint eslint-plugin-import
+script:
+  - npm test
 node_js:
-  - "5.5"
-  - "4.4.6"
+  - "6"
+  - "5"
+  - "4"

appveyor.yml

@@ -0,0 +1,27 @@
+# appveyor file
+# http://www.appveyor.com/docs/appveyor-yml
+
+environment:
+  matrix:
+    - nodejs_version: 4
+    - nodejs_version: 5
+    - nodejs_version: 6
+
+version: "{build}"
+build: off
+deploy: off
+matrix:
+  fast_finish: true
+
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - npm --version
+  - npm -g install npm@3
+  - set PATH=%APPDATA%\npm;%PATH%
+  - npm install eslint eslint-plugin-import
+  - npm install --ignore-scripts --force
+
+test_script:
+  - node --version
+  - npm --version
+  - npm test