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

Author: greenkeeper[bot]

package.json

@@ -72,7 +72,7 @@
     "eslint": "^4.16.0",
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-flowtype": "^2.41.0",
-    "flow-bin": "^0.71.0",
+    "flow-bin": "^0.73.0",
     "fs-extra": "^6.0.1",
     "husky": "^0.14.3",
     "jest": "^22.1.4",