!297 移除saveOrUpdate的事务

Merge pull request !297 from handy/handy-1222

mybatis-plus-extension/src/main/java/com/baomidou/mybatisplus/extension/service/impl/ServiceImpl.java

@@ -195,7 +195,6 @@ public class ServiceImpl<M extends BaseMapper<T>, T> implements IService<T> {
      * @param entity 实体对象
      * @return boolean
      */
-    @Transactional(rollbackFor = Exception.class)
     @Override
     public boolean saveOrUpdate(T entity) {
         if (null != entity) {