[4.6] Remove --recreate from .travis.yml (#5384)

[asottile]

Remove --recreate from .travis.yml

[blueyed]

Isn't it a no-op basically? (we have cache: no)
Why the backport?

[codecov]

Codecov Report

Merging #5386 into 4.6-maintenance will increase coverage by 2.6%.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           4.6-maintenance    #5386     +/-   ##
==================================================
+ Coverage            92.34%   94.95%   +2.6%     
==================================================
  Files                  115      115             
  Lines                26362    26362             
  Branches              2603     2603             
==================================================
+ Hits                 24343    25031    +688     
+ Misses                1674     1023    -651     
+ Partials               345      308     -37

Impacted Files	Coverage Δ
testing/python/metafunc.py	81.38% <0%> (-13.54%)	⬇️
testing/test_warnings.py	45.35% <0%> (-3.83%)	⬇️
src/_pytest/main.py	96.06% <0%> (+0.21%)	⬆️
src/_pytest/fixtures.py	97.55% <0%> (+0.27%)	⬆️
testing/test_assertrewrite.py	84.06% <0%> (+0.29%)	⬆️
testing/test_capture.py	99.25% <0%> (+0.29%)	⬆️
testing/test_config.py	99.82% <0%> (+0.34%)	⬆️
testing/test_pdb.py	98.44% <0%> (+0.38%)	⬆️
src/_pytest/pytester.py	89.83% <0%> (+0.42%)	⬆️
src/_pytest/assertion/rewrite.py	95.77% <0%> (+0.48%)	⬆️
... and 19 more

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[asottile]

🤷‍♂️ I figure why not - - and potentially reduce conflicts

[nicoddemus]

FTR I don't think this has any practical effect on Travis, given that Travis runs on fresh VMs so all environments are created from scratch anyway. 🤷‍♂