Revert "移除了没必要打印的System.out.println"

This reverts commit 73092ce42d21234e385e904e903bc50ea291e28d.

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/spring/MybatisSqlSessionFactoryBean.java

@@ -606,6 +606,7 @@ public class MybatisSqlSessionFactoryBean implements FactoryBean<SqlSessionFacto
         }
 
         final SqlSessionFactory sqlSessionFactory = new MybatisSqlSessionFactoryBuilder().build(targetConfiguration);
+        System.out.println(sqlSessionFactory);
         // TODO SqlRunner
         SqlHelper.FACTORY = sqlSessionFactory;