Update file(s) from wp-cli/.github

Author: schlessera

.travis.yml

@@ -1,9 +1,12 @@
 os: linux
-dist: trusty
+dist: xenial
 
 language: php
 php: 7.4
 
+services:
+  - mysql
+
 notifications:
   email:
     on_success: never
@@ -71,10 +74,7 @@ jobs:
     - stage: test
       php: 5.6
       env: WP_VERSION=3.7.11
+      dist: trusty
     - stage: test
       php: 5.6
       env: WP_VERSION=trunk
-    - stage: test
-      php: 5.4
-      dist: precise
-      env: WP_VERSION=5.1