Feature request: support git fetch

[AoDev]

Hello, during our build process, we checkout version tags.

Sometimes the tags are not pulled so it would be nice to be able to call git fetch with its different options

• --tags
• --all
  ...

I am leaving for a week but when I come back I can send a PR. Thanks for this great module. :)

[rubenv]

Shouldn't be hard to add!

[AoDev]

Check the PR when you have time. If any problem with it, I'll fix it next week ;)

[rubenv]

Leaving this issue open for a while. Your PR is valid for #44. I really need to check up on the other commands and make a release of master. Soon.

Thanks a lot.

[rubenv]

Oh one more thing. Could you add a section to README.md?

[AoDev]

Nice to see it merged so fast:) OK for the docs, this for sure will be next week.

[rubenv]

Fixed!