Don't try to run 'DB=mysql' tests on PHP 7.2
diff --git a/.travis.yml b/.travis.yml
index c235b38..0449889 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,6 +43,8 @@
       env: DB=mysql
     - php: 7.1
       env: DB=mysql
+    - php: 7.2
+      env: DB=mysql
 
 branches:
   only: