support for Loggers

[llllllllll]

addresses #94

Interestingly, this worked on PyPy without my change but it produced a very large serialized form.

[codecov-io]

Codecov Report

Merging #95 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   79.88%   80.03%   +0.15%     
==========================================
  Files           2        2              
  Lines         522      526       +4     
  Branches      109      109              
==========================================
+ Hits          417      421       +4     
  Misses         75       75              
  Partials       30       30

Impacted Files	Coverage Δ
cloudpickle/cloudpickle.py	79.92% <100%> (+0.15%)	⬆️

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[pitrou]

Oops, I pushed another PR in #96.

[rgbkrk]

Since this one is passing and first currently, I lean towards merging this one. Y'all got this though.

[pitrou]

PR #96 has more thorough tests, though. I'll fix the failing test on 2.6.

[llllllllll]

Closing in favor of #96