message: fix(common): correct mapping of Observable methods
  fixes
  PR Close
diff: @@ -14,7 +14,7 @@ const globals = {
  'rxjs/Observer': 'Rx',
  'rxjs/Subject': 'Rx',
  - 'rxjs/observable/of': 'Rx.Observable.prototype',
  + 'rxjs/observable/of': 'Rx.Observable',
  'rxjs/operator/concatMap': 'Rx.Observable.prototype',
  'rxjs/operator/filter': 'Rx.Observable.prototype',
  