Remove EOL python versions

What's Changed

• Remove EOL Python by @tammoippen in #12 (also adds type information)

Full Changelog: v1.4.0...v2.0.0

Remove pyproject.toml from sdist

v1.4.0

CI Issues

CircleCI and PEP-517 compliance

• Add build-system table to pyproject.toml (#8)
• Circle ci (#9)

Fix neighbours

• neighbours near poles (#6) (thx @evanfields )
  • North-pole hashs do not have south-pole hashs as neighbours anymore (and vise versa)
• Fix flake8 issues (#7)

Poetry and CI stuff

v1.2.1

Bump version

v1.2: Version 1.2

Buildsystem, CI, README

v1.1

Version 1.1

v1.0

Version 1.0

v0.4

Add python versions

v0.3

Simplified and perf improved (on my machine)