Merge pull request #668 from LLK/greenkeeper/react-modal-2.3.1

Update react-modal to the latest version 🚀

package.json

@@ -71,7 +71,7 @@
     "react-draggable": "3.0.2",
     "react-intl": "2.3.0",
     "react-intl-redux": "0.6.0",
-    "react-modal": "2.2.4",
+    "react-modal": "2.3.1",
     "react-redux": "5.0.6",
     "react-responsive": "1.3.4",
     "react-style-proptype": "3.0.0",