Merge pull request #474 from nextcloud/tests/remove-old

Remove tests for old stable branches

.travis.yml

@@ -15,12 +15,6 @@ env:
 
 matrix:
   include:
-  - php: 5.6
-    env: "DB=sqlite CORE_BRANCH=stable13 TEST=lint"
-  - php: 7.0
-    env: "DB=sqlite CORE_BRANCH=stable13"
-  - php: 7.2
-    env: "DB=sqlite CORE_BRANCH=stable14"
   - php: 7.2
     env: "DB=sqlite"
   - php: 7.2