Merge pull request #79 from josmo/drone-rc-release-fix

Drone rc release fix

.drone.yml

@@ -7,7 +7,7 @@ pipeline:
     pull: true
     commands:
     - go get -u github.com/golang/dep/cmd/dep
-    - dep ensure
+    - dep ensure -update
 
   test:
     image: golang:1.10

plugin/plugin.go

@@ -149,7 +149,7 @@ func setHelmCommand(p *Plugin) {
 		setDeleteCommand(p)
 	default:
 		switch os.Getenv("DRONE_BUILD_EVENT") {
-		case "push", "tag", "deployment", "pull_request":
+		case "push", "tag", "deployment", "pull_request", "promote", "rollback":
 			setUpgradeCommand(p)
 		case "delete":
 			setDeleteCommand(p)