additional mac gmpy2 requirements (#145)

Co-authored-by: Matt Florence <matt@mattflo.com>
Co-authored-by: Keith Fung <keithrfung@users.noreply.github.com>

Author: 3 people

Makefile

@@ -37,6 +37,8 @@ install-mac:
 	@echo 🍎 MACOS INSTALL
 # gmpy2 requirements
 	brew install gmp || true
+	brew install mpfr || true
+	brew install libmpc || true
 # install module
 	pipenv run python -m pip install -e .