Remove obsolete branch alias and add PHP 7.3 to Travis builds

.travis.yml

@@ -11,6 +11,8 @@ matrix:
       env: DB=MYSQL INSTALLER_VERSION=4.3.x-dev PHPUNIT_COVERAGE_TEST=1
     - php: 7.2
       env: DB=MYSQL INSTALLER_VERSION=4.3.x-dev PHPUNIT_TEST=1
+    - php: 7.3
+      env: DB=MYSQL INSTALLER_VERSION=4.4.x-dev PHPUNIT_TEST=1
     - php: 7.3
       env: DB=MYSQL INSTALLER_VERSION=4.x-dev PHPUNIT_TEST=1
 

composer.json

@@ -25,9 +25,6 @@
         "squizlabs/php_codesniffer": "^3.0"
     },
     "extra": {
-        "branch-alias": {
-            "dev-master": "3.x-dev"
-        },
         "expose": [
             "css",
             "javascript",