Add flow-bin to devDeps

Author: STRML

package.json

@@ -44,6 +44,7 @@
     "css-loader": "^0.23.1",
     "eslint": "^1.10.3",
     "eslint-plugin-react": "^3.16.1",
+    "flow-bin": "^0.25.0",
     "lodash": "^4.3.0",
     "pre-commit": "^1.1.2",
     "react": "^15.0.0",