Yarn start Failed with "Error: Unable to resolve module react-redux" (#883)

Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/883

https://github.com/facebook/flipper/issues/835

Reviewed By: passy

Differential Revision: D20363818

fbshipit-source-id: 66b7cb7236c7b066db32473a9e993ba2ace529bc

_watchmanconfig

@@ -1,3 +1,2 @@
 {
-  "ignore_dirs": ["node_modules", "build", "dist"]
 }