Try testing PyPy's 3.6 branch too

[njsmith]

No description provided.

[codecov]

Codecov Report

Merging #590 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #590   +/-   ##
=======================================
  Coverage   99.27%   99.27%           
=======================================
  Files          89       89           
  Lines       10651    10651           
  Branches      747      747           
=======================================
  Hits        10574    10574           
  Misses         59       59           
  Partials       18       18

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[njsmith]

This was a spur of the moment experiment, but since it passed I guess we might as well keep it?

[pquentin]

👍