Add coverage on Branch master.

README.md

@@ -6,6 +6,7 @@ Sky Walking
 SkyWalking: Large-Scale Distributed Systems Tracing Infrastructure, also known Distributed Tracer.
 
 [![Build Status](https://travis-ci.org/wu-sheng/sky-walking.svg?branch=master)](https://travis-ci.org/wu-sheng/sky-walking)
+[![Coverage Status](https://coveralls.io/repos/github/wu-sheng/sky-walking/badge.svg?branch=master)](https://coveralls.io/github/wu-sheng/sky-walking?branch=master)
 ![license](https://img.shields.io/aur/license/yaourt.svg)
 [![codebeat badge](https://codebeat.co/badges/579e4dce-1dc7-4f32-a163-c164eafa1335)](https://codebeat.co/projects/github-com-wu-sheng-sky-walking)
 [![Join the chat at https://gitter.im/sky-walking/Lobby](https://badges.gitter.im/sky-walking/Lobby.svg)](https://gitter.im/sky-walking/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)

skywalking-commons/skywalking-trace/src/main/java/com/a/eye/skywalking/trace/SegmentsMessage.java

 package com.a.eye.skywalking.trace;
 
-import com.a.eye.skywalking.trace.TraceId.PropagatedTraceId;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import com.google.gson.TypeAdapter;