docs(readme): update help content of command (#585)
docs(readme): update help content of command (#585)

* Update README.md

* restore line

* docs(readme): update help content of command

* Add `--packageManager` option.
* README has also been updated because the display contents have changed due to the update of 'commander'.

Co-authored-by: Reynaldo Pena <f0f64b982488f00dff9511dc3975638bb1380ff8@gmail.com>
Co-authored-by: Chase <702b78f40c5a2ca98cd4b8d93a310953dc695daa@sillevis.net>
motdotla/node-lambda,motdotla/node-lambda