1.4.0 - Unicode 15.0 support

What's Changed

• Update to the Unicode 15.0 dataset by @SteppingHat in #9

Full Changelog: 1.3...1.4

⚠️ Unicode 15.0 has updated metadata for some emojis ⚠️

For example, the category for ❤️ changed from 'emotion' to 'heart'. This caused one of the tests to fail, which has been amended to reflect the new data.

Due to the nature of Unicode and how emoji data is managed, this will not be means for a major release.

The purpose of the tests are to ensure that this package works as intended, and not to validate the Unicode data itself. If there are any issues that arise, please report an issue.