chore(package): update eslint-plugin-flowtype to version 5.1.0

Closes #618

Author: greenkeeper[bot]

package.json

@@ -46,7 +46,7 @@
     "enzyme-adapter-react-16": "1.15.2",
     "eslint": "6.8.0",
     "eslint-config-react-app": "5.2.1",
-    "eslint-plugin-flowtype": "4.7.0",
+    "eslint-plugin-flowtype": "5.1.0",
     "eslint-plugin-import": "2.20.2",
     "eslint-plugin-jsx-a11y": "6.2.3",
     "eslint-plugin-react": "7.19.0",