chore(package): update flow-bin to version 0.56.0

Author: greenkeeper[bot]

package.json

@@ -95,7 +95,7 @@
     "eslint-config-xo-space": "^0.16.0",
     "eslint-plugin-flowtype": "^2.35.0",
     "express": "^4.15.4",
-    "flow-bin": "^0.54.0",
+    "flow-bin": "^0.56.0",
     "flow-remove-types": "^1.2.1",
     "generate-release": "^0.13.1",
     "nodemon": "^1.11.0",