Merge pull request #5 from nextcloud/update-stable15-target-versions

Update stable15 target versions

Author: blizzz

.drone.yml

@@ -8,7 +8,7 @@ pipeline:
     image: nextcloudci/php7.0:php7.0-19
     environment:
     - APP_NAME=workflow_script
-    - CORE_BRANCH=master
+    - CORE_BRANCH=stable15
     - DB=sqlite
     commands:
     # Pre-setup steps
@@ -24,7 +24,7 @@ pipeline:
     image: nextcloudci/php7.0:php7.0-19
     environment:
       - APP_NAME=workflow_script
-      - CORE_BRANCH=master
+      - CORE_BRANCH=stable15
       - DB=sqlite
     commands:
       - wget https://raw.githubusercontent.com/nextcloud/travis_ci/master/before_install.sh