Parse entire commit message not only first line

Commit-Messages via `danger.git.commits` return only the first line and is parsed

- no body
- special chars (like `!`) are removed

What I am trying to achieve are warnings based on file changes in combination with commit guidelines (e.g. breaking changes with [conventional commits](https://www.conventionalcommits.org/en/)).

message:
```
test!: breaking change

- this is the commit body with different "%&&%"§!_" signs

BREAKING-CHANGE:
here are breaking changes. what kind of actions are required?
```

danger returns:
```
message: 'test-breaking-change'
```

I guess is how the message is processed (locally?)
https://github.com/danger/danger-js/blob/4100842c8922fa46e975ed772c1eb6ece677ff7e/source/platforms/git/localGetCommits.ts#L17

Start in source/platforms/git/localGetCommits.ts around line 17 and trace how danger.git.commits processes commit messages. Verify the behavior against the example containing a body, special characters, and BREAKING-CHANGE text; done means the returned message preserves the entire commit message rather than only a normalized first line.

Written by the indexing model from the issue text.