Merge pull request #70 from nextcloud/update-stable20-target-versions

Update stable20 target versions

Author: MorrisJobke

.travis.yml

@@ -2,14 +2,14 @@ language: php
 #php:
 #  - 7.2
 #  - 7.3
-#  - 7.4snapshot
+#  - 7.4
 
 services:
   - mysql
 
 env:
   global:
-    - CORE_BRANCH=master
+    - CORE_BRANCH=stable20
     - APP_NAME=nextcloud_announcements
 #  matrix:
 #    - DB=sqlite