Bump dataclasses from 0.4 to 0.6

[dependabot-preview]

Bumps dataclasses from 0.4 to 0.6.

Commits

• 2307584 Add upload target. Add paths to python and twine. I realize
• 4cc2636 Change 'tests' target to 'run-tests'
• bb3d900 Add "make clean" target.
• f6341f0 Prepare for 0.6 release.
• e205204 Start to prepare for a release matching Python 3.7.0rc1.
• e183d0c Include the readme as a long description (#128)
• 95b3967 Bring code up to date with 3.7.0b4
• e23ea08 Make license agree with the license classifier.
• 1d0b235 Change license to Apache 2.0. Add LICENSE.txt and copyright language. (#124)
• a6d977b Remove unnecessary import 'field' (#122)
• Additional commits viewable in compare view

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[coveralls]

Pull Request Test Coverage Report for Build 110

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 80.984%

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Totals
Change from base Build 108:	0.0%
Covered Lines:	609
Relevant Lines:	752

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💛 - Coveralls

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@93c932c). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #62   +/-   ##
=========================================
  Coverage          ?   24.72%           
=========================================
  Files             ?       12           
  Lines             ?      902           
  Branches          ?        0           
=========================================
  Hits              ?      223           
  Misses            ?      679           
  Partials          ?        0

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