1、【更新】说明文档。

Signed-off-by: armink <armink.ztl@gmail.com>

README.md

@@ -1,6 +1,6 @@
 # CmBacktrace: ARM Cortex-M 系列 MCU 错误追踪库
 
-[![GitHub release](https://img.shields.io/github/release/armink/CmBacktrace.svg)](https://github.com/armink/CmBacktrace/releases/latest) [![GitHub commits](https://img.shields.io/github/commits-since/armink/CmBacktrace/0.2.0.svg)](https://github.com/armink/CmBacktrace/0.2.0...master) [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/armink/CmBacktrace/master/LICENSE)
+[![GitHub release](https://img.shields.io/github/release/armink/CmBacktrace.svg)](https://github.com/armink/CmBacktrace/releases/latest) [![GitHub commits](https://img.shields.io/github/commits-since/armink/CmBacktrace/0.2.0.svg)](https://github.com/armink/CmBacktrace/compare/0.2.0...master) [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/armink/CmBacktrace/master/LICENSE)
 
 ## 0、CmBacktrace 是什么