id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
362918990,MDExOlB1bGxSZXF1ZXN0MjE3NDk1OTc5,2433,Contour labels kwarg,2448579,closed,0,,,3,2018-09-23T06:52:15Z,2019-06-13T15:35:44Z,2019-06-13T15:35:44Z,MEMBER,,0,pydata/xarray/pulls/2433," - [x] Tests added (for all bug fixes or enhancements)
 - [x] Tests passed (for all non-documentation changes)
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API (remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later)

Adds a `labels` boolean kwarg for `contour` that adds contour labels. Also adds `clabel_kwargs` that is passed on to `Axes.clabel()`

`air.isel(time=0).plot.contour(labels=True, colors='k', clabel_kwargs={'fmt': '%.1f'})`

![image](https://user-images.githubusercontent.com/2448579/45925039-913c5180-bf48-11e8-8626-805c117ab6f3.png)

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