Add support for Golang

[albertorestifo]

Would be fantastic to have support for Golang

[biletskyy]

Thanks for your interest to this theme. I added basic support for Golang. But I had zero experience with Golang, so it might be suboptimal or incomplete. I will look into it in more depth in the future. And I will appreciate your comments and suggestion.

[albertorestifo]

Sure, I'll check out the change a let you know if I've specific feedback or maybe make a PR myself.

Keep up the good work!

[albertorestifo]

Just one small things, maybe hilight the types?

In this example the string keyword has the following classes: storage type string go

[biletskyy]

Yes, I agree with your suggestion. Updated the theme.