0.4.0 -- first alpha relese

[0.4.0-alpha.0] - 2022-10-28

Bug Fixes

• [breaking] Graph::generation_time() now returns GenerationTime. (#204)

Documentation

• Hide setup code in demes::load example (#205)
• Document json cargo feature (#209)

Features

• Add several pub fns and an example. (#201)
• Add JSON support via cargo feature (#206)

Miscellaneous Tasks

• Update github actions (#208)

Styling

• Fix lints from nightly clippy (#200)

Testing

• Use cargo hack to run tests (#207)