2.0.0 - Pilzwand

• Breaking changes! Updated collection code for proper Prometheus support. #13
  • Now metrics names of all subcollectors have prefixes:
    nsq_topic_, nsq_channel_, nsq_client_
    As a result metrics registration code now passing Prometheus' client validation,
    also it fixes scrape warnings
  • "type" label in exported metrics removed as obsolete
• Add reset of gauges before scrape (like in haproxy-exporter) #13