Bump flowtype plugin (codeclimate#606)

Author: f-moya

package.json

@@ -51,7 +51,6 @@
     "eslint-config-prettier": "^6.15.0",
     "eslint-config-react-app": "^3.0.4",
     "eslint-config-secure": "^0.2.1",
-    "eslint-config-signavio": "^3.2.0",
     "eslint-config-signavio-test": "^2.0.0",
     "eslint-config-simplifield": "^8.1.0",
     "eslint-config-standard": "^12.0.0",
@@ -73,7 +72,7 @@
     "eslint-plugin-es5": "^1.2.0",
     "eslint-plugin-eslint-comments": "^3.1.1",
     "eslint-plugin-filenames": "^1.3.2",
-    "eslint-plugin-flowtype": "^8.0.3",
+    "eslint-plugin-flowtype": "5.8.2",
     "eslint-plugin-formatjs": "^2.17.9",
     "eslint-plugin-html": "^4.0.6",
     "eslint-plugin-import": "^2.17.3",