Apply labels based on branch name

Hi there! At my work we usually include the type of work in our branch name eg. `feature/whatever-this-branch-does`.

Wondering if if would be possible to add the option to add labels based on the branch name as well as the files have changed?

Maybe something like this:
```yml
feature:
- branch: 'feature/*
```
to apply the `feature` label to a matching branch. 