linked pip to the install page for pip; refs
@@ -25,7 +25,7 @@ generate an access token and access token secret. With these four variables
in hand you are ready to start using twarc.
1. install [Python](http://python.org/download) (2 or 3)
-2. pip install twarc (if upgrading: pip install --upgrade twarc)
+2. [pip](https://pip.pypa.io/en/stable/installing/) install twarc
## Quickstart:
