Update python-requests to e48fea

lib/requests/__init__.py

lib/requests/adapters.py

lib/requests/api.py

lib/requests/auth.py

lib/requests/cacert.pem

lib/requests/cookies.py

lib/requests/exceptions.py

lib/requests/hooks.py

lib/requests/models.py

lib/requests/packages/README.rst

lib/requests/packages/__init__.py

lib/requests/packages/chardet/chardetect.py

lib/requests/packages/urllib3/__init__.py

lib/requests/packages/urllib3/_collections.py

lib/requests/packages/urllib3/connection.py

lib/requests/packages/urllib3/connectionpool.py

lib/requests/packages/urllib3/contrib/appengine.py

lib/requests/packages/urllib3/contrib/pyopenssl.py

lib/requests/packages/urllib3/exceptions.py

lib/requests/packages/urllib3/poolmanager.py