Fix travis dsn

.travis.yml

@@ -9,7 +9,7 @@ php:
 
 env:
   matrix:
-    - DB=mysql db_class='Cake\Database\Driver\Mysql' db_dsn='mysql:host=0.0.0.0;dbname=cakephp_test' db_database='cakephp_test' db_username='travis' db_password=''
+    - DB=mysql db_dsn='mysql://root@127.0.0.1/cakephp_test'
     - DB=pgsql db_class='Cake\Database\Driver\Postgres' db_dsn='pgsql:host=127.0.0.1;dbname=cakephp_test' db_database="cakephp_test" db_username='postgres' db_password=''
     - DB=sqlite db_class='Cake\Database\Driver\Sqlite' db_dsn='sqlite::memory:'
   global: