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
327905732,MDExOlB1bGxSZXF1ZXN0MTkxNTg1ODU4,2204,update minimum versions and associated code cleanup,2443309,closed,0,,2856429,6,2018-05-30T21:27:14Z,2018-07-08T00:55:36Z,2018-07-08T00:55:32Z,MEMBER,,0,pydata/xarray/pulls/2204," - [x] closes #2200, closes #1829, closes #2203 
 - [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)

This updates the following minimum versions:

- numpy: 1.11 (Mar 27, 2016) --> 1.12 (Jan 15, 2017)
- pandas: 0.18 (Mar 11, 2016) --> 0.19 (Oct 2, 2016)
- dask: 0.9 (May 10, 2016) -->  0.16

and drops our tests for python 3.4.
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