Add PHP 7.3 to Travis builds

.travis.yml

@@ -1,32 +1,25 @@
-# See https://github.com/silverstripe-labs/silverstripe-travis-support for setup details
+# See https://github.com/silverstripe/silverstripe-travis-support for setup details
 
-sudo: false
+dist: trusty
 
 language: php
 
-php:
-  - 5.4
-  - 5.5
-  - 5.6
-  - 7.0
-
-env:
-  - DB=MYSQL CORE_RELEASE=3.2
-
 matrix:
   include:
-    - php: 5.6
-      env: DB=MYSQL CORE_RELEASE=3
-    - php: 5.6
-      env: DB=MYSQL CORE_RELEASE=3.1
-    - php: 5.6
-      env: DB=PGSQL CORE_RELEASE=3.2
-  allow_failures:
-    - php: 7.0
+    - php: '5.6'
+      env: DB=MYSQL CORE_RELEASE=3.6
+    - php: '7.0'
+      env: DB=MYSQL CORE_RELEASE=3.7
+    - php: '7.1'
+      env: DB=PGSQL CORE_RELEASE=3.7
+    - php: '7.2'
+      env: DB=MYSQL CORE_RELEASE=3.7
+    - php: '7.3'
+      env: DB=MYSQL CORE_RELEASE=3.7
 
 before_script:
   - composer self-update || true
-  - git clone git://github.com/silverstripe-labs/silverstripe-travis-support.git ~/travis-support
+  - git clone git://github.com/silverstripe/silverstripe-travis-support.git ~/travis-support
   - php ~/travis-support/travis_setup.php --source `pwd` --target ~/builds/ss
   - cd ~/builds/ss
   - composer install

composer.json

@@ -16,8 +16,11 @@
         }
     ],
     "require": {
-        "silverstripe/framework": ">=3.1",
-        "silverstripe/cms": ">=3.1"
+        "silverstripe/framework": "^3.1",
+        "silverstripe/cms": "^3.1"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^5.7"
     },
     "extra": []
 }