chore(package): update eslint-plugin-flowtype to version 3.11.1

Closes #26

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
     "babel-eslint": "^10.0.1",
     "eslint": "^5.0.1",
     "eslint-config-google": "^0.10.0",
-    "eslint-plugin-flowtype": "^2.46.3",
+    "eslint-plugin-flowtype": "^3.11.1",
     "eslint-plugin-import": "^2.11.0",
     "flow-bin": "^0.83.0",
     "lerna": "^2.11.0",