修复bug traceid 获取不到的问题

src/main/java/com/xiaomai/client/XMAppApi.java

@@ -226,7 +226,7 @@ public class XMAppApi {
         this.api_startTime = start;
         Long requestTime = end - start;
         this.api_requestTime = requestTime;
-        this.api_traceId = head.get("traceId");
+        this.api_traceId = head.get("traceid");
         this.api_request_data = json;
         this.api_request_params = params;
         this.api_request_headers = headers;
@@ -281,7 +281,7 @@ public class XMAppApi {
         Long requestTime = end - start;
         this.api_requestTime = requestTime;
         this.api_response = response;
-        this.api_traceId = head.get("traceId");
+        this.api_traceId = head.get("traceid");
         this.setApi_request_data(json);
         this.setApi_request_params(params);
         this.api_request_headers = headers;