增加获取企业微信服务商token、open_corpid 信息

qywx-sdk/src/main/java/com/usoftchina/qywx/sdk/DevSDK.java

@@ -52,7 +52,7 @@ public class DevSDK  extends BaseSdk {
     //获取企业主体的明文corpid转换为服务商主体的密文corpid
     public GetOpenCorpIDResp getCorpid_to_openCorpid(String cropId, String providerToken) {
         ResponseEntity<GetOpenCorpIDResp> resp = restTemplate.postForEntity(
-                baseUrl + "cgi-bin/service/corpid_to_opencorpid?provider_access_token={access_token}",
+                baseUrl + "/cgi-bin/service/corpid_to_opencorpid?provider_access_token={access_token}",
                 new ModelMap("corpid", cropId),
                 GetOpenCorpIDResp.class,
                 new ModelMap("access_token", providerToken));