Update font-hackgen from 1.4.0 to 2.1.0 (#2237)
Update font-hackgen from 1.4.0 to 2.1.0 (#2237)

* Update font-hackgen from 1.4.0 to 2.1.0

* Insert final newline

* Remove final newline
alerque/homebrew-fonts,alerque/homebrew-fonts