Merge pull request #1477 from mozilla/greenkeeper/eslint-3.12.1

Update eslint to the latest version 🚀

package.json

@@ -214,7 +214,7 @@
     "csp-parse": "0.0.2",
     "css-loader": "0.26.1",
     "deepcopy": "0.6.3",
-    "eslint": "3.12.0",
+    "eslint": "3.12.1",
     "eslint-config-airbnb": "13.0.0",
     "eslint-plugin-import": "2.2.0",
     "eslint-plugin-jsx-a11y": "2.2.3",