Add a Safari pinned tab icon?

[bobmaerten]

I often keep hotel as a pinned tab in Safari, like other tabs I want to quickly access like GitHub notifications or my current project issues. But as you can see on the following screenshot, there's no icon when I pin Hotel tab.

I though may be I could rasterize the png logo and make a PR to add an svg version and this simple line in the index.html file:

<link rel="mask-icon" href="hotel.svg" color="#9A58B2">

but the png icon is really to small to convert to svg. Is there anywhere I can find an higher resolution version of the Hotel favicon?