Merge pull request cogent3#969 from GavinHuttley/develop

Fixed toml file, bumped release number

Merge pull request cogent3#967 from GavinHuttley/develop

REL: updated version strings to 2021.10.12a

Merge pull request cogent3#910 from GavinHuttley/develop

REL: version 2021.5.7a

Merge pull request cogent3#893 from GavinHuttley/develop

REL: updated version to 2021.04.20a

REL: bumped version to 2020.12.21a

DOC: updated README

Merge pull request cogent3#680 from cogent3/release

Release 2020.6.30a0

REL: bumped version to 2020.2.7a

mergded upstream

Merge pull request cogent3#397 from cogent3/release

Release 2019.11.15a proper