Semantic Versioning 2.0.0 badge

[dagpunk]

New features

• Display a badge in the project readme indicating the project uses Semantic Versioning 2.0.0 to define release version numbers

Notes

Example markdown:

[SemVer](https://semver.org/) version observance: ![semver](https://img.shields.io/badge/semver-2.0.0-blue)

https://github.com/badges/shields/blob/b624179b8d7b138c756b98f6c912ae282f7d31c1/README.md?plain=1#L67

Example badge: