Merge pull request symfonycorp#152 from OskarStark/patch-4

Use latest version in example

Author: fabpot

services/postgresql.rst

@@ -10,7 +10,7 @@ To use it in your application, add it to ``.symfony/services.yaml``:
     mydatabase:
         # supported versions: 9.6, 10, 11, 12, 13
         # 9.3 is also available but not maintained upstream
-        type: postgresql:12
+        type: postgresql:13
         disk: 1024
 
 .. caution::