Consider adding ligatures for "=~" and "!~"

[slrtbtfs]

These operators are used in the Prometheus Query Language PromQL, to to express something should match a regex (=~) or should not match a regex (!~).

[tonsky]

Hi! Thanks for the suggestion. They are already in the font since v3, must be enabled via ss07 #293 https://github.com/tonsky/FiraCode/wiki/How-to-enable-stylistic-sets