Sash hover border color token (#213)
Sash hover border color token (#213)

VS Code 1.52 [1] (November 2020) introduced the new `sash.hoverBorder`
theme color token for the sash border in hover state [2].
It has been added using `nord8` to make it more conform with Nord's
style.

[1]: https://code.visualstudio.com/updates/v1_52
[2]: https://code.visualstudio.com/updates/v1_52#_sash-hover-border-color

Co-authored-by: Sven Greb <05134426bcd175050b08193c02f14ccdafcca088@svengreb.de>

Closes GH-204
arcticicestudio/nord-visual-studio-code,arcticicestudio/nord-visual-studio-code