[v0.3.0] 2020-03-31

• Add health check endpoints #32 @mosuka
• Add some metrics #31 @mosuka
• Allow CLI options to be read from the configuration file #29 @mosuka
• Fix gateway bug #26 @mosuka
• Support TLS #25 @mosuka
• Add keepalive options #24 @mosuka
• Improve cluster watching #22 @mosuka
• Refactoring #21 @mosuka
• Update Makefile #20 @mosuka