go to oldest-supported-numpy to support API differences in numpy versions

[jdtuck]

Should really transition to PEP518 and using pyproject.toml, but this will fix #974

[jdtuck]

Let me know if you would like me to just change it over to pyproject.toml. This would fix downstream issues right away.

[codecov]

Codecov Report

Merging #975 (68b44f5) into devel (bb1bc50) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel     #975      +/-   ##
==========================================
- Coverage   54.50%   54.49%   -0.01%     
==========================================
  Files         210      210              
  Lines       21557    21560       +3     
  Branches     3168     3169       +1     
==========================================
  Hits        11750    11750              
- Misses       9253     9255       +2     
- Partials      554      555       +1     

[ekalosak]

Please do the pyproject.toml transition - that's pretty much become the standard, not that I need to tell you @jdtuck .

cc: @lawrennd @apaleyes

[jdtuck]

@ekalosak Just pushed to change to pyproject.toml. Not 100% familiar with all the details of the setup.py, so let me know if I missed anything.