Add gogs to update script

src/freedombone

       echo 'git stash drop' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
       echo 'git pull' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
   fi
+  if grep -Fxq "install_gogs" $COMPLETION_FILE; then
+      echo '' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
+      echo 'cd /home/git/go/src/github.com/gogits/gogs' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
+      echo 'git stash' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
+      echo 'git stash drop' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
+      echo 'git pull' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
+  fi
+
   echo 'exit 0' >> /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
   chmod +x /etc/cron.weekly/$UPGRADE_SCRIPT_NAME
   echo 'create_upgrade_script' >> $COMPLETION_FILE