Merge remote-tracking branch 'origin'

Author: bradrydzewski

scm/driver/bitbucket/testdata/webhooks/push.json.golden

@@ -1,5 +1,6 @@
 {
     "Ref": "refs/heads/master",
+    "Before": "40e7580cf11311d84a6e5e97e2cbba6df1675750",
     "Repo": {
         "ID": "{bc771cbf-829e-4c4b-b71f-a0eb3ac2b860}",
         "Namespace": "brydzewski",

scm/driver/bitbucket/webhook.go

@@ -494,6 +494,7 @@ func convertPushHook(src *pushHook) *scm.PushHook {
 	namespace, name := scm.Split(src.Repository.FullName)
 	dst := &scm.PushHook{
 		Ref: scm.ExpandRef(change.New.Name, "refs/heads/"),
+		Before: change.Old.Target.Hash,
 		Commit: scm.Commit{
 			Sha:     change.New.Target.Hash,
 			Message: change.New.Target.Message,