try to improve codecov

[gaborbernat]

If we can't use coveralls; we might need to try to fix it. Here it just retries if fails.

[codecov]

Codecov Report

Merging #1028 into master will decrease coverage by 0.97%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1028      +/-   ##
==========================================
- Coverage   70.33%   69.36%   -0.98%     
==========================================
  Files          14       14              
  Lines        3486     3486              
  Branches      465      465              
==========================================
- Hits         2452     2418      -34     
- Misses        971     1004      +33     
- Partials       63       64       +1

Impacted Files	Coverage Δ
src/tox/interpreters.py	64.74% <0%> (-17.99%)	⬇️
src/tox/venv.py	78.58% <0%> (-0.89%)	⬇️
src/tox/session.py	77.81% <0%> (-0.32%)	⬇️
src/tox/_pytestplugin.py	80.8% <0%> (-0.31%)	⬇️
src/tox/config.py	64.95% <0%> (-0.16%)	⬇️
src/tox/_quickstart.py	42.85% <0%> (ø)	⬆️

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[gaborbernat]

Seems codecov does not support Azure DevOps. oh well coveralls it is then.

[obestwalter]

[obestwalter]

oh ... what? I thought coveralls was the one that does not play nicely yet with Azure DevOps. So both are not really there yet? Classic early adopter problems I guess.

[thedrow]

Travis already has a shell function that retries.
We should probably use that instead.