gaussiant 0.5.0

Gaussian integers
Documentation 
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## unreleased

- Use [`primal`](https://crates.io/crates/primal) in `is_gaussian_prime` algorithm.
  Much, much faster!
- Added a new example `prime1mod4` to compute a certain kind of Gaussian prime.
- Rename `is_divisor_of` method to `divides`.
- Add `units` function to return ±1, ±*i*.
- Add `is_associated` method.

## Release 0.4.0 (2022-01-28)

<!-- Releasing software is fun! -->

Add `gaussint` macro for creating new `GaussianInt`s.

## Release 0.3.1 (2022-01-28)

Fix the status badge on crates.io.

## Release 0.3.0 (2022-01-28)

- Add a method to test for congruence between two Gaussian integers, modulo a third.
- Add methods to test for "even" and "odd" Gaussian integers.

## Earlier

Lost to time...