docs: update readme for 2.20 (#6874)

#### What type of PR is this?

/kind documentation

#### What this PR does / why we need it:

更新快速开始的版本号。

#### Does this PR introduce a user-facing change?

```release-note
None
```
pull/6876/head^2
Ryan Wang 2024-10-16 11:13:27 +08:00 committed by GitHub
parent b95a83a242
commit c9869b7d20
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@ -28,7 +28,7 @@
## 快速开始
```bash
docker run -d --name halo -p 8090:8090 -v ~/.halo2:/root/.halo2 halohub/halo:2.19
docker run -d --name halo -p 8090:8090 -v ~/.halo2:/root/.halo2 halohub/halo:2.20
```
以上仅作为体验使用,详细部署文档请查阅:<https://docs.halo.run/getting-started/install/docker-compose>