Merge pull request #110 from ocefpaf/pin_mysql

test @lsetiawan suggestion

Author: lsetiawan

.travis.yml

@@ -28,6 +28,7 @@ addons:
   apt:
     packages:
       - postgresql-9.5-postgis-2.3
+      - mysql-server-5.6
 
 matrix:
   fast_finish: true