Fine, but at least make it consistent then. GitHub uses "main" and now this uses "primary", next someone will use "base" and I'm not sure at all how this is better in any way.
Amid the currently fashionable trend of language culling, I was mildly surprised to find myself agreeing with this particular change: In git, I think "main" is a better choice than "master", because it more accurately and succinctly reflects the intent.
(In general, though, I think the trend is misguided and counterproductive.)