Update eslint-plugin-flowtype to the latest version 🚀 (parse-community#5826)

* chore(package): update eslint-plugin-flowtype to version 3.12.1

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

Author: greenkeeper[bot]

package-lock.json

@@ -73,7 +73,7 @@
     "cross-env": "5.2.0",
     "deep-diff": "1.0.2",
     "eslint": "6.0.1",
-    "eslint-plugin-flowtype": "3.12.0",
+    "eslint-plugin-flowtype": "3.12.1",
     "flow-bin": "0.103.0",
     "form-data": "2.5.0",
     "gaze": "1.1.3",