Travis xenial update

.travis.yml

@@ -1,6 +1,14 @@
 language: php
 
-dist: trusty
+dist: xenial
+
+services:
+  - mysql
+  - postgresql
+
+cache:
+  directories:
+    - $HOME/.composer/cache/files
 
 env:
   global:
@@ -9,15 +17,15 @@ env:
 matrix:
   include:
     - php: 7.1
-      env: DB=MYSQL INSTALLER_VERSION=4.2.x-dev PHPCS_TEST=1 PHPUNIT_TEST=1
-    - php: 7.1
-      env: DB=PGSQL INSTALLER_VERSION=4.3.x-dev PHPUNIT_TEST=1
+      env: DB=MYSQL INSTALLER_VERSION=4.5.x-dev PHPUNIT_TEST=1 PHPCS_TEST=1 PDO=1
     - php: 7.2
-      env: DB=MYSQL INSTALLER_VERSION=4.4.x-dev PHPUNIT_COVERAGE_TEST=1
+      env: DB=PGSQL INSTALLER_VERSION=4.6.x-dev PHPUNIT_COVERAGE_TEST=1
     - php: 7.3
-      env: DB=MYSQL INSTALLER_VERSION=4.5.x-dev PHPUNIT_TEST=1 SUBSITES=1
-    - php: 7.4
       env: DB=MYSQL INSTALLER_VERSION=4.6.x-dev PHPUNIT_TEST=1
+    - php: 7.3
+      env: DB=MYSQL INSTALLER_VERSION=4.6.x-dev PHPUNIT_TEST=1 SUBSITES=1
+    - php: 7.4
+      env: DB=MYSQL INSTALLER_VERSION=4.x-dev PHPUNIT_TEST=1
 
 before_script:
   - phpenv rehash
@@ -25,11 +33,13 @@ before_script:
   - echo 'memory_limit=2G' >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
 
   - composer validate
+  - composer require silverstripe/installer "$INSTALLER_VERSION" --no-update
+  # Fix for running phpunit 5 on php 7.4+
+  - composer require --no-update sminnee/phpunit-mock-objects:^3
   - composer require symbiote/silverstripe-queuedjobs:^4 --no-update
   - if [[ $SUBSITES ]]; then composer require silverstripe/subsites:^2 --no-update; fi
   - if [[ $DB == "PGSQL" ]]; then composer require silverstripe/postgresql:^2 --no-update; fi
   - composer require --no-update sminnee/phpunit-mock-objects:^3
-  - composer require silverstripe/installer "$INSTALLER_VERSION" --no-update
   - composer install --prefer-dist --no-interaction --no-progress --no-suggest --optimize-autoloader --verbose --profile
 
 script: