chore(dependencies): Upgrade flow to 0.53 (#208)

Author: danez

package.json

@@ -46,7 +46,7 @@
     "babel-preset-flow": "^6.23.0",
     "cross-spawn": "^5.0.0",
     "eslint": "^4.3.0",
-    "flow-bin": "^0.50.0",
+    "flow-bin": "^0.53.1",
     "jest": "^20.0.4",
     "rimraf": "^2.3.2",
     "temp": "^0.8.1"