Remove duplicate from Checkstyle config

Author: garydgregory

src/conf/checkstyle/checkstyle.xml

@@ -70,12 +70,6 @@ limitations under the License.
       <property name="separated" value="true"/>
     </module>
   </module>
-  <!-- @author tags are deprecated -->
-  <module name="RegexpSingleline">
-    <property name="format" value="^\s+\*\s+@author\s" />
-    <property name="message" value="Deprecated @author tag" />
-    <property name="fileExtensions" value="java" />
-    <property name="severity" value="warning" />
-  </module>
+
 </module>