ci: Travis: add pypy3 to allowed failures temporarily

[blueyed]

Ref: #5334
Ref: #5317

[codecov]

Codecov Report

Merging #5340 into features will increase coverage by 1.07%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           features    #5340      +/-   ##
============================================
+ Coverage      92.4%   93.47%   +1.07%     
============================================
  Files           115      115              
  Lines         26294    26441     +147     
  Branches       2597     2631      +34     
============================================
+ Hits          24297    24716     +419     
+ Misses         1677     1407     -270     
+ Partials        320      318       -2

Impacted Files	Coverage Δ
testing/test_tmpdir.py	75.8% <0%> (-23.12%)	⬇️
testing/python/fixtures.py	78.46% <0%> (-12.26%)	⬇️
testing/test_pluginmanager.py	67.37% <0%> (-7.63%)	⬇️
src/_pytest/debugging.py	84.18% <0%> (-5.65%)	⬇️
src/_pytest/tmpdir.py	96.59% <0%> (-3.41%)	⬇️
testing/test_terminal.py	95.64% <0%> (-2.49%)	⬇️
src/_pytest/pytester.py	88.81% <0%> (-0.71%)	⬇️
src/_pytest/config/__init__.py	93.79% <0%> (-0.64%)	⬇️
src/_pytest/fixtures.py	97.79% <0%> (-0.14%)	⬇️
src/_pytest/main.py	96.06% <0%> (+0.21%)	⬆️
... and 12 more

---

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 b10f289...5ac498e. Read the comment docs.

[codecov]

Codecov Report

Merging #5340 into features will increase coverage by 2.69%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           features    #5340      +/-   ##
============================================
+ Coverage      92.4%   95.09%   +2.69%     
============================================
  Files           115      115              
  Lines         26294    26953     +659     
  Branches       2597     2753     +156     
============================================
+ Hits          24297    25632    +1335     
+ Misses         1677     1010     -667     
+ Partials        320      311       -9

Impacted Files	Coverage Δ
testing/test_pluginmanager.py	67.37% <0%> (-7.63%)	⬇️
src/_pytest/debugging.py	84.18% <0%> (-5.65%)	⬇️
testing/python/fixtures.py	87.17% <0%> (-3.56%)	⬇️
testing/test_tmpdir.py	97.31% <0%> (-1.62%)	⬇️
src/_pytest/config/__init__.py	93.79% <0%> (-0.64%)	⬇️
testing/conftest.py	100% <0%> (ø)	⬆️
testing/test_cacheprovider.py	99.77% <0%> (+0.03%)	⬆️
src/_pytest/main.py	96.06% <0%> (+0.21%)	⬆️
testing/test_pytester.py	89.29% <0%> (+0.27%)	⬆️
src/_pytest/cacheprovider.py	98.63% <0%> (+0.79%)	⬆️
... and 14 more

---

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 b10f289...5ac498e. Read the comment docs.

[blueyed]

Let's try to fix it instead first.

[blueyed]

Re-opening: #5334 (comment)

[nicoddemus]

Thanks!

[nicoddemus]

@asottile we're all set for 4.6. Want to make that release? 😁

[blueyed]

JFI: this causes Travis builds to become even slower, since it now gets run as the last job: https://travis-ci.org/pytest-dev/pytest/builds/539900223