Add PHP 7.2 and 7.3 to Travis builds

.travis.yml

@@ -31,12 +31,14 @@ matrix:
       env: DB=MYSQL PHPUNIT_TEST=1 PHPCS_TEST=1
     - php: 7.0
       env: DB=PGSQL PHPUNIT_TEST=1
-    - php: 7.1.2
+    - php: 7.1
       env: DB=MYSQL PDO=1 PHPUNIT_TEST=1
-    - php: 7.0
+    - php: 7.2
       env: DB=MYSQL BEHAT_TEST=1
-    - php: 7.0
+    - php: 7.2
       env: NPM_TEST=1
+    - php: 7.3
+      env: DB=MYSQL PHPUNIT_TEST=1
 
 before_script:
 # Extra $PATH