migrate to pyproject.toml

this resolves dependency issue on setuptools

rename downloaded files (#56)

Fix broken download function (#55)

* Fix broken download function

* remove deprecation warning

Use non-deprecated API for download() (#54)

update github url in package description

add method for revoking access token; fix #55

list all files via cursor

add fingerprint param for authorization url

specify license in setup.py; fix #44

Python3 support for dict.iteritems() in strptime() (#43)

* python3 support for iteritems()

otherwise, created_at returns None

* try:except block removed

.items() will work for older versions too. i thought that it may not work for older versions (~py2.6). but it was wrong.