Do not test PHP 7.3 with Drupal 7

Author: csandanov

.travis.yml

@@ -8,7 +8,7 @@ env:
     - DRUPAL_VER=8 PHP_VER=7.3
     - DRUPAL_VER=8 PHP_VER=7.2
     - DRUPAL_VER=8 PHP_VER=7.1
-    - DRUPAL_VER=7 PHP_VER=7.3
+#    - DRUPAL_VER=7 PHP_VER=7.3
     - DRUPAL_VER=7 PHP_VER=7.2
     - DRUPAL_VER=7 PHP_VER=7.1
     - DRUPAL_VER=7 PHP_VER=5.6 GITHUB_RELEASE=1