Merge pull request #283 from 0x46616c6b/nsq-exporter

add nsq-exporter

content/docs/instrumenting/exporters.md

@@ -52,6 +52,7 @@ hosted outside of the Prometheus GitHub organization.
    * [MongoDB exporter](https://github.com/dcu/mongodb_exporter)
    * [Munin exporter](https://github.com/pvdh/munin_exporter)
    * [New Relic exporter](https://github.com/jfindley/newrelic_exporter)
+   * [NSQ exporter](https://github.com/lovoo/nsq_exporter)
    * [PostgreSQL exporter](https://github.com/wrouesnel/postgres_exporter)
    * [RabbitMQ exporter](https://github.com/kbudde/rabbitmq_exporter)
    * [Redis exporter](https://github.com/oliver006/redis_exporter)