Removed `--vendor-chunk` option.
Removed `--vendor-chunk` option.

Per [angular cli
documentation](https://github.com/angular/angular-cli/wiki/build),
`--vendor-chunk` increases bundle sizes when used with
`--build-optimizer` because "having vendor code in the same chunk as app
code makes it possible for Uglify to remove more unused code."

einargs/esca,einargs/esca,einargs/esca