Merge pull request #17 from tinify/features/ruby-4.0

Features/ruby 4.0

Merge pull request #16 from tinify/releases/1.7.1

Releases/1.7.1

Update ruby version in publish and integration tests

Update gemfile.lock

Bump version to 1.5.1

Bump version in lockfile.

Allow RBX to fail.

Add integration test for metadata preservation.

Fewer escape characters.

Bump version.