bitbucket repository support

[Origin page](https://www.webcomponents.org/)

Hi

I'm trying to publish an element that is present in npm, but hosted on bitbucket.org that is github alternative. But publish button says:

Error - 15
Unable to process element
{"message": "No github URL associated with package", "code": 15}

Can you add support for this hosting as it's also provides free repos for opensource projects.

Here is the link to my project: https://www.npmjs.com/package/gridy-grid