Use "format_map(data)" instead of "format(**data)"

[ericvsmith]

format_map(data) was added specifically to improve the performance and behavior of format(**data). I realize this isn't a feature in 2.7, but if you're adding f-strings they you should also mention format_map. I can't remember when it was added, but it might be as far back as 3.2. So all supported versions of 3.x support it.

[ulope]

Thanks for the pointer.

I really plan to get v2 out this year 🤞

[xmo-odoo]

That seems to correspond to / overlap with #44