Save bound classmethod py27

[pierreglaser]

Fixes #288.

[codecov]

Codecov Report

Merging #289 into master will increase coverage by 26.12%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           master     #289       +/-   ##
===========================================
+ Coverage   66.66%   92.78%   +26.12%     
===========================================
  Files           2        2               
  Lines         846      846               
  Branches      177      177               
===========================================
+ Hits          564      785      +221     
+ Misses        259       37      -222     
- Partials       23       24        +1

Impacted Files	Coverage Δ
cloudpickle/cloudpickle.py	91.96% <100%> (+1.28%)	⬆️
cloudpickle/cloudpickle_fast.py	95.08% <0%> (+95.08%)	⬆️

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[ogrisel]

The fix is simple. Let's merge but let's wait a bit prior to releasing 1.2.2.