Is it possible to get branch name in a adapter?

Hi,

First of all, great project!

Is it possible to pass information about a branch (or some other git information) to an custom adapter?

I find this line: https://github.com/commitizen/cz-cli/blob/master/src/cli/strategies/git-cz.js#L59 where it looks like you are passing all arguments to `git`(?). Is it possible to parse the arguments and exclude `cz-cli`-specific arguments and pass them to a adapter?

Example:

```
$ git cz --author="Name " --cz-branch-name="$(git rev-parse --abbrev-ref HEAD)"
```

The command above should pass `--author` to `git commit` and `--cz-branch-name` to the adapter (because the argument starts with `--cz-`).

What do you think? Is this a good solution? Or is it a better way?