v0.5.7

Changelog

7338557 Release v0.5.7
0b507dc Release v0.5.8-pro
a842d4f Release v0.5.9-pro
1fbb99c add git versioning, used for Pro rollbacks and deployment changelog. Closes #100
a505a51 update github.com/tj/go to v1.8.1 for error masking bug

---

Automated with GoReleaser
Built with go version go1.10 darwin/amd64