Update README_ZH.md

README_ZH.md

 Sky Walking | [English](README.md)
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-<img src="https://sky-walking.github.io/page-resources/3.0/skywalking.png" alt="Sky Walking logo" height="90px" align="right" />
+<img src="https://skywalkingtest.github.io/page-resources/3.0/skywalking.png" alt="Sky Walking logo" height="90px" align="right" />
 
 **SkyWalking 3**: 针对分布式系统的APM系统，也被称为分布式追踪系统
 
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