v2.22.0
adding unicode_is_ascii utility function
remove final remnants from 2.6
get(), request(): fix documentation of 'params'
cleanup certs.py
Use comprehensions whenever possible
Check if host is invalid for proxy
Set iter_lines() decode_unicode default to False
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