chore(package): update flow-bin to version 0.54.1

Closes #21

Author: greenkeeper[bot]

package.json

@@ -50,7 +50,7 @@
     "eslint-config-airbnb-base": "^11.1.3",
     "eslint-plugin-babel": "^4.1.1",
     "eslint-plugin-import": "^2.2.0",
-    "flow-bin": "^0.43.1",
+    "flow-bin": "^0.54.1",
     "flow-coverage-report": "^0.3.0",
     "graphql": "^0.9.2",
     "jest": "^19.0.2",