Release v0.6.0

docker run synadia/prometheus-nats-exporter:0.6.0

Changelog

a9d1e46 Merge pull request #98 from nats-io/release/v0.6.0
7e5ffbb Bump version to 0.6.0
21f0e17 Add replicator metrics (#96)
057940a Merge pull request #95 from nats-io/nss-prefix
4ba77fd Allow changing STAN exporter prefix
b149e67 Merge pull request #93 from nats-io/release/v0.5.0
5ae5a8c Bump to v0.5.0