Constrain more_itertools for Python 2.7 compatibility

[sambrightman]

Fixes #4772, #4770.

There was some discussion in #4770 that maybe this can be written slightly differently but it worked for me like this.

I assume this doesn't require a changelog entry.

[nicoddemus]

Thanks a lot @sambrightman for providing this PR and testing that it works.

I assume this doesn't require a changelog entry.

Oh I believe it does, as definitely the Python 2 users which are facing this problem would like to know about it in the CHANGELOG. 👍

[sambrightman]

Ok, changelog entry added.

[hugovk]

Fixes #4772, #4770.

GitHub tip: when this is merged, only the first issue will be autoclosed. Repeat the keyword to autoclose both:

Fixes #4772, fixes #4770.

Docs: https://help.github.com/articles/closing-issues-using-keywords/

[sambrightman]

Thanks! In this case #4772 is already closed.

[codecov]

Codecov Report

Merging #4774 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4774      +/-   ##
==========================================
+ Coverage   95.67%   95.69%   +0.01%     
==========================================
  Files         113      113              
  Lines       25012    25012              
  Branches     2484     2484              
==========================================
+ Hits        23930    23935       +5     
+ Misses        764      762       -2     
+ Partials      318      315       -3

Flag	Coverage Δ
#docs	29.66% <ø> (+0.1%)	⬆️
#doctesting	29.66% <ø> (+0.1%)	⬆️
#linting	29.66% <ø> (+0.1%)	⬆️
#linux	95.52% <ø> (+0.03%)	⬆️
#nobyte	92.3% <ø> (ø)	⬆️
#numpy	93.07% <ø> (+0.01%)	⬆️
#pexpect	42.04% <ø> (+0.02%)	⬆️
#pluggymaster	93.81% <ø> (+0.1%)	⬆️
#py27	93.71% <ø> (+0.03%)	⬆️
#py34	91.78% <ø> (+0.06%)	⬆️
#py35	91.78% <ø> (+0.06%)	⬆️
#py36	91.8% <ø> (+0.06%)	⬆️
#py37	93.81% <ø> (ø)	⬆️
#trial	93.07% <ø> (+0.01%)	⬆️
#windows	93.83% <ø> (-0.02%)	⬇️
#xdist	93.73% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
src/_pytest/terminal.py	91.85% <0%> (+0.81%)	⬆️

---

Continue to review full report at Codecov.

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[codecov]

Codecov Report

Merging #4774 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4774      +/-   ##
==========================================
+ Coverage   95.67%   95.69%   +0.01%     
==========================================
  Files         113      113              
  Lines       25012    25012              
  Branches     2484     2484              
==========================================
+ Hits        23930    23935       +5     
+ Misses        764      762       -2     
+ Partials      318      315       -3

Flag	Coverage Δ
#docs	29.66% <ø> (+0.1%)	⬆️
#doctesting	29.66% <ø> (+0.1%)	⬆️
#linting	29.66% <ø> (+0.1%)	⬆️
#linux	95.52% <ø> (+0.03%)	⬆️
#nobyte	92.3% <ø> (ø)	⬆️
#numpy	93.07% <ø> (+0.01%)	⬆️
#pexpect	42.04% <ø> (+0.02%)	⬆️
#pluggymaster	93.81% <ø> (+0.1%)	⬆️
#py27	93.71% <ø> (+0.03%)	⬆️
#py34	91.78% <ø> (+0.06%)	⬆️
#py35	91.78% <ø> (+0.06%)	⬆️
#py36	91.8% <ø> (+0.06%)	⬆️
#py37	93.81% <ø> (ø)	⬆️
#trial	93.07% <ø> (+0.01%)	⬆️
#windows	93.83% <ø> (-0.02%)	⬇️
#xdist	93.73% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
src/_pytest/terminal.py	91.85% <0%> (+0.81%)	⬆️

---

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 67dd10d...a800328. Read the comment docs.