Add logr implementation to README and json.RawMessage to Fields() (#337)

Author: hn8

README.md

@@ -617,6 +617,7 @@ with zerolog library is [CSD](https://github.com/toravir/csd/).
 
 * [grpc-zerolog](https://github.com/cheapRoc/grpc-zerolog): Implementation of `grpclog.LoggerV2` interface using `zerolog`
 * [overlog](https://github.com/Trendyol/overlog): Implementation of `Mapped Diagnostic Context` interface using `zerolog`
+* [zerologr](https://github.com/hn8/zerologr): Implementation of `logr.LogSink` interface using `zerolog`
 
 ## Benchmarks
 

fields.go

@@ -1,6 +1,7 @@
 package zerolog
 
 import (
+	"encoding/json"
 	"net"
 	"sort"
 	"time"
@@ -245,6 +246,8 @@ func appendFields(dst []byte, fields map[string]interface{}) []byte {
 			dst = enc.AppendIPPrefix(dst, val)
 		case net.HardwareAddr:
 			dst = enc.AppendMACAddr(dst, val)
+		case json.RawMessage:
+			dst = appendJSON(dst, val)
 		default:
 			dst = enc.AppendInterface(dst, val)
 		}