MNT: Exclude pytest 5.4.0

[GuillaumeFavelier]

This PR skips pytest 5.4.0 because of the issues with pytest-sugar.

Closes #7437

[GuillaumeFavelier]

I have to remove it from:

mne-python/.travis.yml

Line 69 in 2d8c893

- pip install --upgrade pytest pytest-sugar pytest-cov pytest-mock pytest-timeout codecov

[codecov]

Codecov Report

Merging #7438 into master will increase coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7438      +/-   ##
==========================================
+ Coverage   90.05%   90.12%   +0.07%     
==========================================
  Files         454      454              
  Lines       82323    81500     -823     
  Branches    13022    13021       -1     
==========================================
- Hits        74135    73453     -682     
+ Misses       5366     5219     -147     
- Partials     2822     2828       +6     

[GuillaumeFavelier]

This should be ready now @larsoner, @agramfort, @drammock

[drammock]

thanks @GuillaumeFavelier

[GuillaumeFavelier]

For reference, I suggested Teemu/pytest-sugar#187 (comment) and twmr/pytest-sphinx#11