Add include

Author: webflo

Diff for: .travis.yml

@@ -13,9 +13,10 @@ env:
     - SIMPLETEST_DB=sqlite://tmp/site.sqlite
     - SIMPLETEST_BASE_URL="http://127.0.0.1:8080"
   matrix:
-    - RELEASE=stable COMPOSER_CHANNEL=stable
-    - RELEASE=dev COMPOSER_CHANNEL=stable
-    - RELEASE=stable COMPOSER_CHANNEL=snapshot
+    include:
+      - RELEASE=stable COMPOSER_CHANNEL=stable
+      - RELEASE=dev COMPOSER_CHANNEL=stable
+      - RELEASE=stable COMPOSER_CHANNEL=snapshot
     exclude:
       - php: 7.2
         env: RELEASE=stable