为提高效率，请提供以下信息，问题描述清晰能够更快得到解决：
【TiDB 版本】
[root@10-10-100-80 dm-single]# tiup dm -v
Found dm newer version:
The latest version: v1.3.5
Local installed version: v1.3.4
Update current component: tiup update dm
Update all components: tiup update --all
Starting component `dm`: /root/.tiup/components/dm/v1.3.4/tiup-dm -v
tiup version v1.3.4 tiup
Go Version: go1.13
Git Branch: release-1.3
GitHash: b262d05
【问题描述】
想使用edit-config命令修改dm集群配置，新增worker，但似乎不支持：
[root@10-10-100-80 dm-single]# tiup dm edit-config dmsingle
Found dm newer version:
The latest version: v1.3.5
Local installed version: v1.3.4
Update current component: tiup update dm
Update all components: tiup update --all
Starting component `dm`: /root/.tiup/components/dm/v1.3.4/tiup-dm edit-config dmsingle
New topology could not be saved: immutable field changed: added Workers.3.Host with value '10.10.100.80', added Workers.3.ssh_port with value '22', added Workers.3.Name with value 'worker8362', added Workers.3.Port with value '8362', added Workers.3.DeployDir with value '/data/single/dm-deploy/dm-worker-8362', added Workers.3.DataDir with value '/data/single/dm-data/dm-worker-8362', added Workers.3.Arch with value 'amd64', added Workers.3.OS with value 'linux'
Do you want to continue editing? [Y/n]: n
Nothing changed.
请问，是此命令目前还不支持吗？如果是，是否只能手动启动worker服务来实现？
