Add git tag

Hello @iDuuck ,
I am the member of [cdnjs](https://github.com/cdnjs/cdnjs) project.
We want to host this library.
Please help us add git tag.
Git tag can help us to know your release version.
And we can auto-update the version when you have new release.
Thanks for your help!

https://github.com/cdnjs/cdnjs/issues/8540
