Merge pull request #7 from edx/greenkeeper-lockfile

fix greenkeeper + travis config

.travis.yml

 language: node_js
 
 node_js:
-    - 6
+  - 6
+
+before_install:
+  - yarn global add greenkeeper-lockfile@1
+
+before_script:
+  - greenkeeper-lockfile-update
+
+script:
+  - yarn run lint
+  - yarn run test
 
 after_script:
+  - greenkeeper-lockfile-upload
   - yarn run coveralls

package.json

@@ -41,12 +41,13 @@
     "coveralls": "^2.13.1",
     "css-loader": "^0.28.4",
     "enzyme": "^2.8.2",
-    "eslint": "^4.1.1",
+    "eslint": "^3.19.0",
     "eslint-config-airbnb": "^15.0.1",
     "eslint-config-edx": "^3.0.0",
     "eslint-import-resolver-webpack": "^0.8.1",
-    "eslint-plugin-jsx-a11y": "^6.0.2",
+    "eslint-plugin-jsx-a11y": "^5.1.0",
     "eslint-plugin-react": "^7.1.0",
+    "greenkeeper-lockfile": "^1.7.1",
     "husky": "^0.14.1",
     "identity-obj-proxy": "^3.0.0",
     "jest": "^20.0.4",