added apex/log logging lib

README.md

@@ -468,6 +468,7 @@ See [go-hardware](https://github.com/rakyll/go-hardware) for a comprehensive lis
 * [go-log-interface](https://github.com/ventu-io/go-log-interface) - A generic leveled log interface to adopt any logging framework and a default facade for Go stdlib log.Logger.
 * [go-logger](https://github.com/apsdehal/go-logger) - Simple logger of Go Programs, with level handlers.
 * [gologger](https://github.com/sadlil/gologger) - Simple easy to use log lib for go, logs in Colored Cosole, Simple Console, File or Elasticsearch.
+* [log](https://github.com/apex/log) - Structured logging package for Go.
 * [log-voyage](https://github.com/firstrow/logvoyage) - Full-featured logging saas written in golang.
 * [log15](https://github.com/inconshreveable/log15) - Simple, powerful logging for Go
 * [logex](https://github.com/chzyer/logex) - An golang log lib, supports tracking and level, wrap by standard log lib