#884 微信公众号模块增加主体变更迁移用户openid的接口

* 增加接口 微信公众号主体变更迁移用户 openid

* add test

weixin-java-mp/pom.xml

@@ -36,6 +36,11 @@
       <artifactId>testng</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-all</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <groupId>com.google.inject</groupId>
       <artifactId>guice</artifactId>