v2.20.1
v2.20.0
adding unicode_is_ascii utility function
remove final remnants from 2.6
Prefer https:// for URLs throughout project
cleanup certs.py
Use comprehensions whenever possible
Check if host is invalid for proxy
Fix requests.packages not having package attributes
proper handling for default ports in auth stripping
Fix an invalid escape sequence
Separate collections from collections.abc
Merge pull request #2 from requests/master