tox.ini: clean up changedir

[blueyed]

No description provided.

[coveralls]

Coverage increased (+0.02%) to 93.829% when pulling 3bd9f98 on blueyed:cov-pexpect into c6c326f on pytest-dev:master.

[codecov]

Codecov Report

Merging #4138 into master will increase coverage by 0.73%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4138      +/-   ##
==========================================
+ Coverage   94.48%   95.22%   +0.73%     
==========================================
  Files         109      109              
  Lines       23824    23824              
  Branches     2352     2352              
==========================================
+ Hits        22511    22686     +175     
+ Misses       1004      833     -171     
+ Partials      309      305       -4

Flag	Coverage Δ
#linux	95.1% <ø> (+0.75%)	⬆️
#nobyte	17.99% <ø> (+17.99%)	⬆️
#numpy	28.07% <ø> (-0.01%)	⬇️
#pexpect	38.57% <ø> (+38.57%)	⬆️
#py27	93.42% <ø> (+0.75%)	⬆️
#py34	92.15% <ø> (+0.03%)	⬆️
#py35	92.04% <ø> (-0.09%)	⬇️
#py36	93.28% <ø> (+0.58%)	⬆️
#py37	92.2% <ø> (-0.14%)	⬇️
#trial	31.15% <ø> (-0.16%)	⬇️
#windows	92.86% <ø> (-0.98%)	⬇️
#xdist	18.49% <ø> (-0.05%)	⬇️

Impacted Files	Coverage Δ
src/_pytest/capture.py	88.55% <0%> (-1.38%)	⬇️
src/_pytest/assertion/rewrite.py	95.51% <0%> (+0.16%)	⬆️
src/_pytest/pytester.py	86.77% <0%> (+0.75%)	⬆️
testing/test_terminal.py	97.44% <0%> (+0.78%)	⬆️
src/_pytest/terminal.py	91.62% <0%> (+1.74%)	⬆️
src/_pytest/helpconfig.py	86.91% <0%> (+1.86%)	⬆️
testing/test_pdb.py	94.91% <0%> (+42.51%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update c6c326f...3bd9f98. Read the comment docs.

[nicoddemus]

Flaky failure: #4144