v0.4.0 / 2018-08-10

- [CHANGE] Include consul check status in consul_health_service_status prometheus#53
- [CHANGE] Adopt standard Prometheus flags library (mostly double dashes) prometheus#66
- [FEATURE] Add AllowStale/RequireConsistent/Datacenter flags prometheus#69
- [FEATURE] Expose consul_service_tag metric prometheus#56
- [ENHANCEMENT] Fetch health summaries in parallel prometheus#68