Remove unnecessary import

src/site/plugins_extensions.mkd

@@ -96,7 +96,6 @@ import ro.fortsoft.pf4j.Extension;
 import org.kohsuke.args4j.Option;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import com.gitblit.models.UserModel;
 import com.gitblit.transport.ssh.commands.CommandMetaData;
 import com.gitblit.transport.ssh.commands.DispatchCommand;
 import com.gitblit.transport.ssh.commands.UsageExample;