Update react-dnd to the latest version 🚀 (#1111)

* fix(package): update react-dnd to version 8.0.0

* fix(package): update react-dnd-html5-backend to version 8.0.0

* chore(package): update lockfile package-lock.json

Author: greenkeeper[bot]

package-lock.json

@@ -55,8 +55,8 @@
     "prismjs": "1.16.0",
     "query-string": "6.5.0",
     "react": "16.8.6",
-    "react-dnd": "7.6.1",
-    "react-dnd-html5-backend": "7.6.2",
+    "react-dnd": "8.0.0",
+    "react-dnd-html5-backend": "8.0.0",
     "react-dom": "16.8.6",
     "react-helmet": "5.2.1",
     "react-router": "5.0.1",