chore(package): update eslint-plugin-flowtype-errors to version 4.1.0

Closes #21

Author: greenkeeper[bot]

package.json

@@ -44,7 +44,7 @@
     "babel-register": "^6.18.0",
     "eslint-config-airbnb": "^14.1.0",
     "eslint-plugin-flowtype": "^2.29.1",
-    "eslint-plugin-flowtype-errors": "^3.0.0",
+    "eslint-plugin-flowtype-errors": "^4.1.0",
     "eslint-plugin-import": "^2.1.0",
     "eslint-plugin-jsx-a11y": "^4.0.0",
     "eslint-plugin-promise": "^3.3.0",