#34 - Change default postgres version to 11

Author: rbygrave

src/main/java/io/ebean/test/config/platform/PostgresSetup.java

@@ -31,7 +31,7 @@ private Properties dockerProperties(Config config) {
       return new Properties();
     }
 
-    config.setDockerVersion("10");
+    config.setDockerVersion("11");
     config.setExtensions("hstore,pgcrypto");
     return config.getDockerProperties();
   }