Update dependencies for SilverStripe ^4.4

.travis.yml

@@ -8,7 +8,7 @@ before_install:
 
 env:
   global:
-    - COMPOSER_ROOT_VERSION="2.0.x-dev"
+    - COMPOSER_ROOT_VERSION="2.3.x-dev"
     - DISPLAY=":99"
     - XVFBARGS=":99 -ac -screen 0 1024x768x16"
     - SS_BASE_URL="http://localhost:8080/"
@@ -17,15 +17,17 @@ env:
 matrix:
   include:
     - php: 5.6
-      env: DB=MYSQL INSTALLER_VERSION=4.0.x-dev PHPCS_TEST=1 PHPUNIT_TEST=1
+      env: DB=MYSQL INSTALLER_VERSION=4.4.x-dev PHPCS_TEST=1 PHPUNIT_TEST=1
     - php: 7.0
-      env: DB=PGSQL INSTALLER_VERSION=4.1.x-dev PHPUNIT_TEST=1
+      env: DB=PGSQL INSTALLER_VERSION=4.4.x-dev PHPUNIT_TEST=1
     - php: 7.1
-      env: DB=MYSQL INSTALLER_VERSION=4.1.x-dev BEHAT_TEST=1
+      env: DB=MYSQL INSTALLER_VERSION=4.4.x-dev BEHAT_TEST=1
     - php: 7.2
-      env: DB=MYSQL INSTALLER_VERSION=4.2.x-dev PHPUNIT_COVERAGE_TEST=1
+      env: DB=MYSQL INSTALLER_VERSION=4.4.x-dev PHPUNIT_COVERAGE_TEST=1
     - php: 7.2
       env: DB=MYSQL INSTALLER_VERSION=4.x-dev BEHAT_TEST=1
+    - php: 7.3
+      env: DB=MYSQL INSTALLER_VERSION=4.4.x-dev PHPUNIT_TEST=1
 
 before_script:
   # Extra $PATH
@@ -39,7 +41,7 @@ before_script:
   # Install composer
   - composer validate
   - composer require silverstripe/installer:"$INSTALLER_VERSION" silverstripe/recipe-testing:^1 --no-update
-  - if [[ $DB == PGSQL ]]; then composer require --no-update silverstripe/postgresql:2.0.x-dev; fi
+  - if [[ $DB == PGSQL ]]; then composer require --no-update silverstripe/postgresql:2.2.x-dev; fi
   - composer install --prefer-source --no-interaction --no-progress --no-suggest --optimize-autoloader --verbose --profile
 
   # Behat bootstrapping

composer.json

@@ -15,12 +15,12 @@
         }
     ],
     "require": {
-        "silverstripe/framework": "^4",
-        "silverstripe/cms": "^4",
-        "silverstripe/admin": "^1",
-        "silverstripe/asset-admin": "^1",
-        "silverstripe/errorpage": "^1",
-        "silverstripe/versioned": "^1"
+        "silverstripe/framework": "^4.4@dev",
+        "silverstripe/cms": "^4.4@dev",
+        "silverstripe/admin": "^1.4@dev",
+        "silverstripe/asset-admin": "^1.4@dev",
+        "silverstripe/errorpage": "^1.4@dev",
+        "silverstripe/versioned": "^1.4@dev"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.7",
@@ -33,9 +33,6 @@
         }
     },
     "extra": {
-        "branch-alias": {
-            "dev-master": "2.x-dev"
-        },
         "expose": [
             "javascript",
             "css"