Fix MySQL host.

.travis.yml

@@ -10,7 +10,7 @@ dist: trusty
 
 env:
   matrix:
-    - DB=mysql db_dsn='mysql://root@0.0.0.0/cakephp_test'
+    - DB=mysql db_dsn='mysql://root@127.0.0.1/cakephp_test'
     - DB=pgsql db_dsn='postgres://postgres@127.0.0.1/cakephp_test'
     - DB=sqlite db_dsn='sqlite:///:memory:'
   global: