updated backup role reference

requirements.yml

diff --git a/requirements.yml b/requirements.yml
index 24da4f6..bba90da 100644
--- a/requirements.yml
+++ b/requirements.yml
@@ -15,7 +15,7 @@
 
 - src: https://github.com/carlosfrias/apigee-opdk-stop-components
 
-- src: https://github.com/carlosfrias/apigee-opdk-backup
+- src: https://github.com/carlosfrias/apigee-opdk-backup.git
 
 - src: https://github.com/carlosfrias/apigee-opdk-restore