Don't add Maven descriptor to build artifacts.

It's pretty useless and it stands in the way of reproducible builds.

pom.xml

@@ -76,6 +76,15 @@
         </configuration>
       </plugin>
 
+      <plugin>
+        <artifactId>maven-jar-plugin</artifactId>
+        <configuration>
+          <archive>
+            <addMavenDescriptor>false</addMavenDescriptor>
+          </archive>
+        </configuration>
+      </plugin>
+
       <plugin>
         <groupId>org.sonatype.plugins</groupId>
         <artifactId>nexus-staging-maven-plugin</artifactId>