3.1.0

Added

• Declare support for Python 3.9 (jmoiron/humanize#171) @jaimcamp
• testing/docs: Include doctests in testing (jmoiron/humanize#168) @carlpatt
• Allow custom "now" in naturaldelta and naturaltime (jmoiron/humanize#144) @phijor

Fixed

• Represent with a zero if the delta is too small (jmoiron/humanize#170) @eldipa