use limited api to build wheels for macOS and linux (#150)
use limited api to build wheels for macOS and linux (#150)

* use limited api to build wheels for macOS and linux

* six is also a dep

* no-deps

alex/bcrypt,reaperhulk/bcrypt,reaperhulk/bcrypt,pyca/bcrypt,pyca/bcrypt,alex/bcrypt,reaperhulk/bcrypt,pyca/bcrypt,pyca/bcrypt,alex/bcrypt,reaperhulk/bcrypt