Release v0.2.2

Docker image available at:

docker run synadia/prometheus-nats-exporter:0.2.2

Added

• Bump Docker images version of Go to 1.12 (a37848f)
• Server info metric (nss_server_info) (654cec6, #70)
• Add inbox label for when multiple subscriptions on single connection (62c5bdd, #65)

Changed

• Add missing maintainer to Debian builds (906e57d, #57, #62)

Fixed

• collected before with the same name and label values when polling (#67)