docs: link to logrus repo/docs (#46)

Author: bmorelli25

README.md

@@ -27,6 +27,7 @@ Learn more in the [ECS Logging Reference](https://www.elastic.co/guide/en/ecs-lo
 * [Python](https://github.com/elastic/ecs-logging-python) ([docs](https://www.elastic.co/guide/en/ecs-logging/python/current/intro.html))
 * Go
   * [zap](https://github.com/elastic/ecs-logging-go-zap) ([docs](https://www.elastic.co/guide/en/ecs-logging/go-zap/current/intro.html))
+  * [logrus](https://github.com/elastic/ecs-logging-go-logrus) ([docs](https://www.elastic.co/guide/en/ecs-logging/go-logrus/current/index.html))
 * [Ruby](https://github.com/elastic/ecs-logging-ruby) ([docs](https://www.elastic.co/guide/en/ecs-logging/ruby/current/intro.html))
 
 ## APM

docs/intro.asciidoc

@@ -31,7 +31,7 @@ They make it easy to format your logs into ECS-compatible JSON. For example:
 Refer to the installation instructions of the individual loggers:
 
 * {ecs-logging-dotnet-ref}/setup.html[.NET]
-* Go ({ecs-logging-go-zap-ref}/setup.html[zap])
+* Go: ({ecs-logging-go-zap-ref}/setup.html[zap]), ({ecs-logging-go-logrus-ref}/setup.html[logrus])
 * {ecs-logging-java-ref}/setup.html[Java]
 * https://github.com/elastic/ecs-logging-js[JavaScript]
 * https://github.com/elastic/ecs-logging-php[PHP]