Merge pull request #2733 from LLK/greenkeeper/react-contextmenu-2.9.3

Update react-contextmenu to the latest version 

package.json

@@ -77,7 +77,7 @@
     "raf": "^3.4.0",
     "raw-loader": "^0.5.1",
     "react": "16.2.0",
-    "react-contextmenu": "2.9.2",
+    "react-contextmenu": "2.9.3",
     "react-dom": "16.2.0",
     "react-draggable": "3.0.5",
     "react-ga": "2.5.3",