Update README.md

Added note to use the CLI instead of Librarian

Author: gonzofish

README.md

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+# With the addition of `ng generate library` to the Angular CLI, you should be using the CLI, as it will be the most up-to-date and consistent method of creating your library. [Docs on `generate library`](https://github.com/angular/angular-cli/wiki/generate-library).
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+Feel free to keep using Angular Librarian, though, but it will receive few, if any, more updates. Thanks to everyone who helped in its development and utilized it!
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 # Angular Librarian
 
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