Simplify travis

Author: dereuromark

.travis.yml

@@ -21,11 +21,11 @@ matrix:
       env: PHPCS=1 DEFAULT=0
 
     - php: 7.0
-      env: DB=pgsql db_class='Cake\Database\Driver\Postgres' db_dsn='postgres://[email protected]/cakephp_test' db_database='cakephp_test' db_username='travis' db_password=''
+      env: DB=pgsql db_dsn='postgres://[email protected]/cakephp_test'
 
   allow_failures:
     - php: 7.0
-      env: DB=pgsql db_class='Cake\Database\Driver\Postgres' db_dsn='postgres://[email protected]/cakephp_test' db_database='cakephp_test' db_username='travis' db_password=''
+      env: DB=pgsql db_dsn='postgres://[email protected]/cakephp_test'
 
 before_script:
   - composer self-update