`nimble develop` ends up in detached state instead of a branch (eg master)
```
nimble develop jester
cd jester
git branch|cat
* (no branch)
```

## maybe related:
[Manually checks out the branch/tag after git clone. by gradha · Pull Request #70 · nim-lang/nimble](https://github.com/nim-lang/nimble/pull/70)
which seems (haven't looked carefully) that the intent was to checkout a branch

