Update eslint-plugin-flowtype to the latest version 🚀 (#6688)

* chore(package): update eslint-plugin-flowtype to version 5.0.0

* chore(package): update lockfile package-lock.json

Co-authored-by: greenkeeper[bot] <23040076+greenkeeper[bot]@users.noreply.github.com>

Author: greenkeeper[bot]

package-lock.json

@@ -76,7 +76,7 @@
     "cross-env": "7.0.2",
     "deep-diff": "1.0.2",
     "eslint": "6.8.0",
-    "eslint-plugin-flowtype": "4.7.0",
+    "eslint-plugin-flowtype": "5.0.0",
     "flow-bin": "0.119.1",
     "form-data": "3.0.0",
     "gaze": "1.1.3",