Fix gpg signature

Author: Artem Labazin

pom.xml

@@ -389,7 +389,7 @@ limitations under the License.
         </configuration>
       </plugin>
 
-<!--      <plugin>
+     <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-gpg-plugin</artifactId>
         <version>1.6</version>
@@ -402,7 +402,7 @@ limitations under the License.
             </goals>
           </execution>
         </executions>
-      </plugin>-->
+      </plugin>
     </plugins>
   </build>
 </project>