reduced runtime deps in order to remove them from uber-jar.
diff --git a/htrace-zipkin/pom.xml b/htrace-zipkin/pom.xml
index 82addff..6f1f324 100644
--- a/htrace-zipkin/pom.xml
+++ b/htrace-zipkin/pom.xml
@@ -69,15 +69,18 @@
       <groupId>org.htrace</groupId>
       <artifactId>htrace-core</artifactId>
       <version>${project.version}</version>
+      <scope>provided</scope>
     </dependency>
     <!-- Global deps. -->
     <dependency>
       <groupId>commons-logging</groupId>
       <artifactId>commons-logging</artifactId>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
+      <scope>provided</scope>
     </dependency>
     <dependency>
       <groupId>junit</groupId>