Hackage version builds neither with GHC 8.0 nor 8.2

`gitlib-3.1.1` fails to build with GHC 8.0 and 8.2 with the error:
```
Git/Working.hs:18:33: error:
    Not in scope: type constructor or class ‘MonadBaseControl’
```

this seems to be fixed in `master`, so please release a new version on Hackage.