Updates rxjs.

Author: adkam

package.json

@@ -87,7 +87,7 @@
     "ng-packagr": "^11.2.2",
     "prettier": "^2.0.5",
     "protractor": "^7.0.0",
-    "rxjs": "^6.6.0",
+    "rxjs": "^6.6.3",
     "standard-version": "^8.0.2",
     "stylelint": "^13.6.1",
     "stylelint-config-prettier": "^8.0.2",