Request: Publish to Open VSX registry

Could you please also publish taskrunner to the [Open VSX](https://open-vsx.org/) registry? The Microsoft extension store can for legal reasons not be used with forks of VSCode. This could enable the use of this extension with the [OSS variant of vscode](https://github.com/microsoft/vscode), [vscodium](https://vscodium.com/), and services like [Gitpod](https://www.gitpod.io/).