Update flow-bin to the latest version 🚀 (#4786)

* chore(package): update flow-bin to version 0.73.0

* chore(package): update lockfile

https://npm.im/greenkeeper-lockfile

Author: greenkeeper[bot]

package-lock.json

@@ -57,7 +57,7 @@
     "deep-diff": "1.0.1",
     "eslint": "^4.9.0",
     "eslint-plugin-flowtype": "^2.39.1",
-    "flow-bin": "^0.71.0",
+    "flow-bin": "^0.73.0",
     "gaze": "1.1.3",
     "jasmine": "3.1.0",
     "jasmine-spec-reporter": "^4.1.0",