Travis config update, remove branch aliases

.travis.yml

@@ -1,25 +1,33 @@
 language: php
 
+dist: xenial
+
+services:
+  - mysql
+  - postgresql
+
 env:
   global:
     - COMPOSER_ROOT_VERSION="2.x-dev"
 
 matrix:
   include:
-    - php: 5.6
-      env: DB=MYSQL PHPCS_TEST=1 PHPUNIT_TEST=1
-    - php: 7.0
-      env: DB=PGSQL PHPUNIT_TEST=1
     - php: 7.1
+      env: DB=MYSQL PHPUNIT_TEST=1
+    - php: 7.1
+      env: DB=PGSQL PHPUNIT_TEST=1
+    - php: 7.2
+      env: DB=MYSQL PHPUNIT_TEST=1 PHPCS_TEST=1
+    - php: 7.3
       env: DB=MYSQL PHPUNIT_COVERAGE_TEST=1
 
 before_script:
   - phpenv rehash
   - phpenv config-rm xdebug.ini
 
-  - composer install --prefer-dist
-  - composer require --prefer-dist --no-update silverstripe/recipe-cms:1.0.x-dev
-  - if [[ $DB == PGSQL ]]; then composer require --prefer-dist --no-update silverstripe/postgresql:2.0.x-dev; fi
+  - composer install --prefer-source
+  - composer require --prefer-source --no-update silverstripe/recipe-cms:^4
+  - if [[ $DB == PGSQL ]]; then composer require --prefer-dist --no-update silverstripe/postgresql:^2; fi
   - composer update
 
 script:

composer.json

@@ -20,9 +20,6 @@
         "squizlabs/php_codesniffer": "^3.0"
     },
     "extra": {
-        "branch-alias": {
-            "dev-master": "2.x-dev"
-        },
         "expose": [
             "css",
             "javascript"