message: Remove --save option as it isn't required anymore
diff: @@ -31,7 +31,7 @@ rxjs-5-to-6-migrate -p [path/to/tsconfig.json]
  In order to minimize the impact of the upgrade, RxJS v6 releases with a sibling package, `rxjs-compat`, which provides a compatibility layer between the v6 and v5 APIs.
  Most developers with existing applications should upgrade by installing both `rxjs` and `rxjs-compat` at ^6.0.0:
  -`npm install rxjs@6 rxjs-compat@6 --save`
  +`npm install rxjs@6 rxjs-compat@6`
  For details about this package, see https://www.npmjs.com/package/rxjs-compat.
  