release 0.6.0

[chfw]

With your PR, here is a check list:

• Has test cases written?
• Has all code lines tested?
• Has make format been run?
• Please update CHANGELOG.yml(not CHANGELOG.rst)
• Passes all Travis CI builds
• Has fair amount of documentation if your change is complex
• Agree on NEW BSD License for your contribution

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@c6e6b97). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master       #4   +/-   ##
=========================================
  Coverage          ?   94.23%           
=========================================
  Files             ?        4           
  Lines             ?       52           
  Branches          ?        0           
=========================================
  Hits              ?       49           
  Misses            ?        3           
  Partials          ?        0           

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