[fonttools/fonttools] d36ac5: requirements.txt: use brotlicffi on pypy

[Cosimo Lupo]

Branch: refs/heads/main
Home: https://github.com/fonttools/fonttools
Commit: d36ac5ca2898a8a4ecb50d56ef5441a5cf3ca054
https://github.com/fonttools/fonttools/commit/d36ac5ca2898a8a4ecb50d56ef5441a5cf3ca054
Author: Cosimo Lupo <cl...@google.com>
Date: 2021-10-19 (Tue, 19 Oct 2021)

Changed paths:
M requirements.txt

Log Message:
-----------
requirements.txt: use brotlicffi on pypy

brotlipy was renamed to brotlicffi, we changed imports and setup.py'
s install_requires in https://github.com/fonttools/fonttools/pull/2117 but forgot to update the requirements.txt file.