chore(package): update react-dnd to version 7.4.2

Closes #1036

Author: greenkeeper[bot]

package.json

@@ -78,7 +78,7 @@
     "prop-types": "15.7.2",
     "query-string": "6.4.2",
     "react": "16.8.4",
-    "react-dnd": "7.4.1",
+    "react-dnd": "7.4.2",
     "react-dnd-html5-backend": "7.4.0",
     "react-dom": "16.8.4",
     "react-router": "4.4.0",