Default dubbo version should remove snapshot (#306)

diff --git a/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml b/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml
index 74b3c64..8ed3e2b 100644
--- a/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml
+++ b/dubbo-samples-metadata-report/dubbo-samples-metadata-report-local-xml/pom.xml
@@ -30,7 +30,7 @@
     <properties>
         <source.level>1.8</source.level>
         <target.level>1.8</target.level>
-        <dubbo.version>2.7.9-SNAPSHOT</dubbo.version>
+        <dubbo.version>2.7.9</dubbo.version>
         <spring.version>4.3.16.RELEASE</spring.version>
         <junit.version>4.12</junit.version>
         <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>