Add New Relic to list of available exporters. (#1172)

Author: purple4reina

README.md

@@ -57,6 +57,7 @@ can implement their own exporters by implementing the exporter interfaces
 * [Datadog][exporter-datadog] for stats and traces
 * [Graphite][exporter-graphite] for stats
 * [Honeycomb][exporter-honeycomb] for traces
+* [New Relic][exporter-newrelic] for stats and traces
 
 ## Overview
 
@@ -261,3 +262,4 @@ release in which the functionality was marked *Deprecated*.
 [exporter-datadog]: https://github.com/DataDog/opencensus-go-exporter-datadog
 [exporter-graphite]: https://github.com/census-ecosystem/opencensus-go-exporter-graphite
 [exporter-honeycomb]: https://github.com/honeycombio/opencensus-exporter
+[exporter-newrelic]: https://github.com/newrelic/newrelic-opencensus-exporter-go