Release 0.6.4

[chfw]

With your PR, here is a check list:

• [ ] Has test cases written?
• [ ] Has all code lines tested?
• [x] Has make format been run?
• [x] 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

Merging #106 into master will increase coverage by 0.07%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   97.83%   97.91%   +0.07%     
==========================================
  Files          52       52              
  Lines        3332     3360      +28     
==========================================
+ Hits         3260     3290      +30     
+ Misses         72       70       -2     

Impacted Files	Coverage Δ
pyexcel_io/database/common.py	100.00% <100.00%> (ø)
pyexcel_io/database/importers/django.py	100.00% <100.00%> (ø)
pyexcel_io/database/importers/sqlalchemy.py	98.27% <100.00%> (+1.97%)	:arrow_up:
tests/test_django_book.py	99.67% <100.00%> (+0.01%)	:arrow_up:
pyexcel_io/plugins.py	96.39% <0.00%> (+0.90%)	:arrow_up:

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[chfw]

enable https://github.com/pyexcel-webwares/django-excel/issues/65