service: update example to use correct import path.

example/main.go

@@ -10,7 +10,7 @@ import (
 	"log"
 	"time"
 
-	"bitbucket.org/kardianos/service2beta"
+	"github.com/kardianos/service"
 )
 
 var logger service.Logger

service.go

@@ -19,7 +19,7 @@
 		"log"
 		"time"
 
-		"bitbucket.org/kardianos/service2beta"
+		"github.com/kardianos/service"
 	)
 
 	var logger service.Logger