Merge pull request #347 from graphql/greenkeeper/flow-bin-0.50.0

Update flow-bin to the latest version 🚀

Author: wincent

package.json

@@ -85,7 +85,7 @@
     "eslint-plugin-flowtype": "2.35.0",
     "express": "4.14.1",
     "express3": "*",
-    "flow-bin": "0.49.1",
+    "flow-bin": "0.50.0",
     "graphql": "0.10.3",
     "isparta": "4.0.0",
     "mocha": "3.4.2",