Bump flowtype plugin to latest (#608)

Author: Federico Moyá

package.json

@@ -72,7 +72,7 @@
     "eslint-plugin-es5": "^1.2.0",
     "eslint-plugin-eslint-comments": "^3.1.1",
     "eslint-plugin-filenames": "^1.3.2",
-    "eslint-plugin-flowtype": "5.8.2",
+    "eslint-plugin-flowtype": "8.0.3",
     "eslint-plugin-formatjs": "^2.17.9",
     "eslint-plugin-html": "^4.0.6",
     "eslint-plugin-import": "^2.17.3",

yarn.lock

@@ -3755,12 +3755,12 @@ eslint-plugin-filenames@^1.3.2:
     lodash.snakecase "4.1.1"
     lodash.upperfirst "4.3.1"
 
-eslint-plugin-flowtype@5.8.2:
-  version "5.8.2"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-flowtype/-/eslint-plugin-flowtype-5.8.2.tgz#e8c4429f2d39d93ccb0732f581b159da16fa0bda"
-  integrity sha512-/aPTnNKNAYJbEU07HwvohnXp0itBT+P0r+7s80IG5eqfsrx4NLN+0rXNztJBc56u1RJegSn0GMt1cZnGZpCThw==
+eslint-plugin-flowtype@8.0.3:
+  version "8.0.3"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-flowtype/-/eslint-plugin-flowtype-8.0.3.tgz#e1557e37118f24734aa3122e7536a038d34a4912"
+  integrity sha512-dX8l6qUL6O+fYPtpNRideCFSpmWOUVx5QcaGLVqe/vlDiBSe4vYljDWDETwnyFzpl7By/WVIu6rcrniCgH9BqQ==
   dependencies:
-    lodash "^4.17.15"
+    lodash "^4.17.21"
     string-natural-compare "^3.0.1"
 
 eslint-plugin-formatjs@^2.17.9: