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@6a5a851). Click here to learn what that means.
The diff coverage is 98.75%.

@@            Coverage Diff            @@
##             master      #38   +/-   ##
=========================================
  Coverage          ?   98.40%           
=========================================
  Files             ?       13           
  Lines             ?      690           
  Branches          ?        0           
=========================================
  Hits              ?      679           
  Misses            ?       11           
  Partials          ?        0           

Impacted Files	Coverage Δ
tests/_compact.py	75.00% <ø> (ø)
pyexcel_xls/xlsw.py	98.14% <95.65%> (ø)
pyexcel_xls/xlsr.py	99.24% <98.27%> (ø)
pyexcel_xls/__init__.py	100.00% <100.00%> (ø)
tests/base.py	98.21% <100.00%> (ø)
tests/test_bug_fixes.py	98.63% <100.00%> (ø)
tests/test_filter.py	100.00% <100.00%> (ø)
tests/test_formatters.py	100.00% <100.00%> (ø)
tests/test_hidden.py	100.00% <100.00%> (ø)
tests/test_merged_cells.py	100.00% <100.00%> (ø)
... and 3 more

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