Fix maven doc.
MODIFY
README.md
README.md
@@ -166,7 +166,7 @@ For Maven, add this to pom.xml:
<!-- OpenTracing API -->
<dependency>
<groupId>io.opentracing</groupId>
- <artifactId>io.opentracing:opentracing-api</artifactId>
+ <artifactId>opentracing-api</artifactId>
<version>0.30.0</version>
</dependency>

Fix maven doc.