Update README.md

Set version

README.md

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 [![GitHub last commit](https://img.shields.io/github/last-commit/derskythe/docker-github-actions-runner?logo=github&logoColor=white&style=plastic)](https://github.com/derskythe/docker-github-actions-runner)
 [![Create containers and deploy](https://github.com/derskythe/docker-github-actions-runner/actions/workflows/build-image.yml/badge.svg?style=plastic)](https://github.com/derskythe/docker-github-actions-runner/actions/workflows/build-image.yml)
 [![BASE build](https://github.com/derskythe/docker-github-actions-runner/actions/workflows/build-base.yml/badge.svg?style=plastic)](https://github.com/derskythe/docker-github-actions-runner/actions/workflows/build-base.yml)
@@ -43,12 +42,12 @@ This is a [fork](https://github.com/myoung34/docker-github-actions-runner).
 ## Tag convention
 
 For example:
-`ubuntu-bionic-2.320.0-31.1`
+`ubuntu-bionic-2.321.0-31.1`
 
 The tag consists entirely of the following parts:
 
 - `ubuntu-bionic` - distributive and version
-- `2.320.0` - version of [Actions Runner](https://github.com/actions/runner/releases)
+- `2.321.0` - version of [Actions Runner](https://github.com/actions/runner/releases)
 - `31.1` - internal build number
 
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