Option to disable the git commit

[pleunv]

Hey guys! I'm looking into using np in our CI flow but there's one scenario I'm not sure it can currently support.

I would like to set up a CI build inside of a mono-repo that builds each package on every commit and publishes it to NPM but without creating an additional version commit. Packages would be versioned with a timestamp instead of an incrementing build number so this would not be necessary (i.e. package@2.0.0-build.1519722154) and it would create a lot of noise. Within the context of a mono-repo this would also create a commit per package which is definitely not desirable.

This differs from the current suggested --no-publish CI approach as we do want to publish to NPM but not to git, so it's rather an inverse scenario. Would you be open to adding an additional --no-commit or --no-git option to faciliate this? I can dig in the code and prepare a PR if so.

[sindresorhus]

#250 (comment)