fix(travis): Use MariaDB 10.3
diff --git a/.travis.yml b/.travis.yml
index 0660779..1561d6c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,8 +2,8 @@
 
 language: python
 
-services:
-  - mysql
+addons:
+  mariadb: 10.3
 
 jobs:
   include: