Update .travis.yml

.travis.yml

@@ -11,7 +11,6 @@ php:
 env:
   matrix:
     - DB=mysql db_dsn='mysql://root@127.0.0.1/cakephp_test'
-    - DB=pgsql db_dsn='postgres://postgres@127.0.0.1/cakephp_test'
   global:
     - DEFAULT=1
 
@@ -26,6 +25,9 @@ matrix:
       env: CODECOVERAGE=1 DEFAULT=0
 
     - php: 7.1
+      env: DB=pgsql db_dsn='postgres://postgres@127.0.0.1/cakephp_test'
+      
+    - php: 7.1
       env: DB=sqlite db_dsn='sqlite:///:memory:'
 
     - php: 5.6