Merge pull request #2869 from mozilla/greenkeeper/raven-2.1.1

Update raven to the latest version 🚀

package.json

@@ -153,7 +153,7 @@
     "normalize.css": "7.0.0",
     "normalizr": "3.2.2",
     "prop-types": "15.5.10",
-    "raven": "2.1.0",
+    "raven": "2.1.1",
     "raven-js": "3.17.0",
     "react": "15.6.1",
     "react-addons-css-transition-group": "15.6.0",