fix retrun value. Publish 0.3.0

.gx/lastpubver

-0.2.0: QmaN6XdKRej6SAGtsXnWZEuUdZn7Ty6odWteeJKcT1VGMt
+0.3.0: QmXWro6iddJRbGWUoZDpTu6tjo5EXX4xJHHR9VczeoGZbw

binding.go

@@ -10,7 +10,7 @@ import (
 
 var log logging.EventLogger = logging.Logger("metrics-prometheus")
 
-func Inject() {
+func Inject() error {
 	return metrics.InjectImpl(newCreator)
 }
 

package.json

@@ -30,5 +30,5 @@
   "language": "go",
   "license": "MIT",
   "name": "go-metrics-prometheus",
-  "version": "0.2.0"
+  "version": "0.3.0"
 }