Modernize to 8.0

Add native type declarations and update to require PHP 8+

Bump versions

Add basic examples and bump composer versions.

Deprecate PHP 5.4 and tidy up

v2.3.0

Merge pull request #50 from shrikeh/feature/update-documentation-and-…

Fix builds

v2.2.1

Copy paste error

Move status codes into separate library

Move all the status codes into a separate library so they can be directly used if someone doesn't want the additional Exceptions/Value Objects etc.

Remove dependencies that require higher PHP versions

Merge pull request #48 from KoenraadM/master

Fixes #47 Dependecy on Nette removed

Move to RFC 72xx

• Move from RFC 2616 to using the RFC 72xx family of RFCs
• Add a Status Line value object
• Tests

v1.0.2: Merge pull request #32 from localheinz/fix/imports

Fix: Remove leading slash when importing, remove unused imports