通过feignClient调用微服务提供的分页对象IPage<T>报错

### 当前使用版本(必须填写清楚，否则不予处理)

<dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.0.7.1</version>
            </dependency>

### 该问题是怎么引起的？**([最新版](https://search.maven.org/search?q=mybatis-plus)上已修复的会直接**close**掉)**

1.生产者：业务微服务有个分页对象方法
![微服务：分页对象方法](https://images.gitee.com/uploads/images/2019/0222/181625_12554a98_1167552.png "屏幕截图.png")

2.feign-api接口定义
![feign层api接口定义](https://images.gitee.com/uploads/images/2019/0222/181732_60c79d4e_1167552.png "屏幕截图.png")

3.消费者，通过feign-api调用
![消费者，通过feign-api调用](https://images.gitee.com/uploads/images/2019/0222/181921_d4176cad_1167552.png "屏幕截图.png")

### 重现步骤

### 报错信息

{
    "timestamp": 1550826494158,
    "status": 500,
    "error": "Internal Server Error",
    "message": "Type definition error: [simple type, class com.baomidou.mybatisplus.core.metadata.IPage]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.baomidou.mybatisplus.core.metadata.IPage` (no Creators, like default construct, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information\n at [Source: (PushbackInputStream); line: 1, column: 1]",
    "path": "-lesson-progress/query-emp-list"
}

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