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
533462810,MDExOlB1bGxSZXF1ZXN0MzQ5NTMzMTYz,3597,Add Facetgrid.row_labels & Facetgrid.col_labels,2448579,closed,0,,,2,2019-12-05T16:35:38Z,2019-12-10T15:41:24Z,2019-12-10T15:41:21Z,MEMBER,,0,pydata/xarray/pulls/3597,"This allows labels to be changed later using `Facetgrid.set_titles`. We now save handles in `Facetgrid.row_labels` and `Facetgrid.col_labels`. I also added some API docs for facetgrid.

Example
```
g = darray.plot.imshow(row=""row"", col=""col"")
g.set_titles(""abc={value}"")
```

**before** (see row labels; the column labels work because those are set using `set_title`. )
![before](https://user-images.githubusercontent.com/2448579/70251014-b8122c80-1776-11ea-93ea-560c1062e374.png)


**after**
![after](https://user-images.githubusercontent.com/2448579/70251111-d7a95500-1776-11ea-8d8f-030ea76bded6.png)


 - [x] Tests added
 - [x] Passes `black . && mypy . && flake8`
 - [x] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API
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