feat(lib): upgraded rxjs

Author: AnthonyNahas

package-lock.json

@@ -53,7 +53,7 @@
     "ngx-clipboard": "^12.3.1",
     "ngx-highlightjs": "^4.1.1",
     "ngx-markdown": "^8.2.2",
-    "rxjs": "^6.6.2",
+    "rxjs": "^6.6.3",
     "tslib": "^2.0.0",
     "zone.js": "^0.10.3"
   },