Other: Changed the URL under bugs key in package.json file. Now we have one...

Other: Changed the URL under bugs key in package.json file. Now we have one issue tracker. See ckeditor/ckeditor5#1988.

package.json

@@ -66,7 +66,7 @@
   "author": "CKSource (http://cksource.com/)",
   "license": "GPL-2.0-or-later",
   "homepage": "https://ckeditor.com/ckeditor-5",
-  "bugs": "https://github.com/ckeditor/ckeditor5-build-decoupled-document/issues",
+  "bugs": "https://github.com/ckeditor/ckeditor5/issues",
   "repository": {
     "type": "git",
     "url": "https://github.com/ckeditor/ckeditor5-build-decoupled-document.git"