string-class-0.1.7.0: CHANGELOG.md

PLACEHOLDER
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0.1.7.0
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* PR #2. Add GHC 8.4 support

0.1.6.4
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0.1.6.3
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* Add homepage and bug-reports to cabal file, linking to the github repository
  and its issue tracker, respectively.
* Added `CHANGELOG.md`.