release this when flit updates >1.1

[jwkvam]

wait on new release of flit https://github.com/takluyver/flit/issues/158 or

redo when https://github.com/pypa/pip/issues/5407#issuecomment-412657550

[codecov[bot]]

Codecov Report

Merging #241 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #241   +/-   ##
=======================================
  Coverage   77.13%   77.13%           
=======================================
  Files          29       29           
  Lines        1736     1736           
=======================================
  Hits         1339     1339           
  Misses        397      397

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