api: cleanup

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

logger/default.go

@@ -12,11 +12,11 @@ import (
 )
 
 type defaultLogger struct {
-	sync.RWMutex
 	enc      *json.Encoder
 	logFunc  LogFunc
 	logfFunc LogfFunc
 	opts     Options
+	sync.RWMutex
 }
 
 // Init(opts...) should only overwrite provided options