Release 1.2.0

[hcho3]

This will incorporate two major new features:

• Faster model import for sklearn tree models (Faster model import for sklearn tree models #264)
• Binary serializer to a file stream (Prototype for binary serializer to a file stream #270)

[codecov-commenter]

Codecov Report

Merging #272 (184ccd3) into mainline (2e41697) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             mainline     #272   +/-   ##
===========================================
  Coverage       84.23%   84.23%           
  Complexity         44       44           
===========================================
  Files              97       97           
  Lines            7442     7442           
  Branches           42       42           
===========================================
  Hits             6269     6269           
  Misses           1149     1149           
  Partials           24       24           

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