Update README.md due to 2.0.0-alpha.2 released (#2546)

#### What type of PR is this?

/kind documentation

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

The README.md is out of date due to [2.0.0-alpha.2](https://github.com/halo-dev/halo/releases/tag/v2.0.0-alpha.2) released.

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

```release-note
None
```
pull/2556/head
John Niang 2022-10-12 17:10:16 +08:00 committed by GitHub
parent 823acdaaae
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@ -35,7 +35,7 @@
### Docker
```bash
docker run -it -d --name halo-next -p 8090:8090 -v ~/halo-next:/root/halo-next --restart=unless-stopped halohub/halo-dev:2.0.0-alpha.1
docker run -it -d --name halo-next -p 8090:8090 -v ~/halo-next:/root/halo-next --restart=unless-stopped halohub/halo-dev:2.0.0-alpha.2
```
详细部署文档请查阅:<https://docs.halo.run/2.0.0-SNAPSHOT/getting-started/install/docker>