In README, include link to package's PyPi page

AaronAtDuo · web-flow · commit 7cf521e2277b · 2023-03-28T10:18:33.000-04:00
diff --git a/README.md b/README.md
@@ -42,6 +42,7 @@ $ python setup.py install
 
 System:
 
+Install from [PyPi](https://pypi.org/project/duo-client/)
 ```
 $ pip install duo-client
 ```
