fix version error

Author: HTHou

distribution/pom.xml

@@ -174,7 +174,7 @@
                 <dependency>
                     <groupId>org.apache.iotdb</groupId>
                     <artifactId>iotdb-ainode</artifactId>
-                    <version>2.0.6-SNAPSHOT</version>
+                    <version>2.0.6</version>
                 </dependency>
             </dependencies>
             <build>

example/client-cpp-example/pom.xml

@@ -24,7 +24,7 @@
     <parent>
         <groupId>org.apache.iotdb</groupId>
         <artifactId>iotdb-examples</artifactId>
-        <version>2.0.6-SNAPSHOT</version>
+        <version>2.0.6</version>
     </parent>
     <artifactId>client-cpp-example</artifactId>
     <name>IoTDB: Example: CPP Client</name>