adding gpg plugin with sha512 config

git-svn-id: https://svn.apache.org/repos/asf/geronimo/specs/trunk@1842390 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/geronimo-validation_2.0_spec/pom.xml b/geronimo-validation_2.0_spec/pom.xml
index 50e6029..a143ab0 100644
--- a/geronimo-validation_2.0_spec/pom.xml
+++ b/geronimo-validation_2.0_spec/pom.xml
@@ -79,6 +79,16 @@
                 </executions>
             </plugin>
             <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-gpg-plugin</artifactId>
+                <version>1.6</version>
+                <configuration>
+                    <gpgArguments>
+                        <arg>--digest-algo=SHA512</arg>
+                    </gpgArguments>
+                </configuration>
+            </plugin>
+            <plugin>
                 <groupId>org.apache.felix</groupId>
                 <artifactId>maven-bundle-plugin</artifactId>
                 <version>3.5.0</version>