chore(package): update eslint-plugin-flowtype to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "eslint-config-prettier": "^3.0.0",
     "eslint-plugin-ava": "^5.0.0",
     "eslint-plugin-babel": "^5.1.0",
-    "eslint-plugin-flowtype": "^2.50.0",
+    "eslint-plugin-flowtype": "^3.0.0",
     "eslint-plugin-import": "^2.12.0",
     "eslint-plugin-jsx-a11y": "^6.0.3",
     "eslint-plugin-react": "^7.9.1",