Allow plugins to alter the paths config

[gaborbernat]

Resolves #967.

[codecov-io]

Codecov Report

Merging #969 into master will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #969      +/-   ##
==========================================
+ Coverage   94.00%   94.04%   +0.03%     
==========================================
  Files          86       86              
  Lines       12107    12121      +14     
  Branches     1212     1214       +2     
==========================================
+ Hits        11381    11399      +18     
+ Misses        590      588       -2     
+ Partials      136      134       -2     

Impacted Files	Coverage Δ
coverage/config.py	98.43% <100.00%> (+0.03%)	⬆️
tests/test_config.py	100.00% <100.00%> (ø)
tests/test_arcs.py	100.00% <0.00%> (+1.45%)	⬆️

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[gaborbernat]

@nedbat any chance to land this? 🤔

[nedbat]

Thanks, this fixes an oversight. If you don't mind me asking, what plugin will you use it for?

[gaborbernat]

covdefaults, linked in the issue.

[nedbat]

This is available in 5.1: https://pypi.org/project/coverage/5.1/