mysql-native v2.0.0-rc3: Third release candidate

Fri Feb 9 05:53:48 UTC 2018

Hopefully the last.

Changes since RC2 listed in changelog:
https://github.com/mysql-d/mysql-native/blob/master/CHANGELOG.md

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Incidentally, when you're sticking to semantic versioning, utilizing 
release candidates and git branches REALLY comes in handy ;)  Highly 
recommend. Work on v2.1.0 is progressing while v2.0.0 is stabilizing. 
Plus, some of the work on v2.1.0 has revealed needs that are best 
included in v2.0.0 to avoid an imminent bump to v3+. Nice.