Add PHP 8.0 support

• Update composer and PHP libraries
• Require PHP >=7.4 or >=8.0

Gutenberg Ready

The taxonomy now shows in the Gutenberg sidebar on the dashboard.

Bug Fixing

Adding slug to default values array

1.0.3

swapping post type check to taxonomy check

Fixing Rewrite Issue

Removing default args fixes rewrite issue

Linting & Clean Up

1.0.1

Linting cleanup

Updating Functionality & README

1.0.0

Updating functionality & README

Initial Release

0.0.1

adding note