Revert wasm using fast path due to dart-lang/sdk/issues/55266 (#181)

Preparing to publish 3.0.5

Revert "Switch sha512 to use fastpath with wasm (#165)"

This reverts commit 69d13c9.

Prepare to release v3.0.4 (#178)

Prepare release with topics (#148)

Prepare to publish (#129)

Fix stale links to docs (#115)

Closes #114

The URL format was updated on the pub site to a `-constant` suffix.

Cleanup:
- Use v1.0 of the Dart setup Github action.
- Test on the oldest supported SDK.
- Change the pubspec `homepage` config to `repository`.
- Use stable versions of dev dependencies.

Prepare to publish for stable null safety (#112)

Migrate to GitHub Actions (#111)

* Migrate to GitHub Actions
* Delete .travis.yml

SHA 512/384 padding is 128 bit (#77)

The SHA algorithms were fine; but the padding in HashSink was hardcoded
to 64-bit signatures. While we still only generate a 64-bit signature,
the signature space is 128-bit.

Fixes #69.

Special thanks to @Nico04 for providing the test cases that lead to this
discovery.

Merge pull request #76 from jonasfj/fix-constant-time-comparison

Fixed constant-time comparison in `Digest`.