Update package.json

change from 
"quill": "^1.3.6",

to 
"quill": "^1.3.7",

package.json

@@ -40,7 +40,7 @@
         "plyr": "^3.5.6",
         "promise-polyfill": "8.1.0",
         "pusher-js": "^4.4.0",
-        "quill": "^1.3.6",
+        "quill": "^1.3.7",
         "readmore-js": "^2.2.1",
         "socket.io-client": "^2.2.0",
         "sweetalert": "^2.1.2",