Adding support for PHP 8.0+ while removing support for PHP 5.x#1

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slapo wants to merge 7 commits intomilindsingh:masterfrom

Commits on Sep 9, 2025

Extracted barcode types into their own value class, so they can be used without the main Barcode class if desired.
Peter Slapansky
committed
Upgrading PHPUnit
Peter Slapansky
committed
Switching to strict comparisons and exlicit type casts to remove ambiguity and more clearly demonstrate comparison intent.
Peter Slapansky
committed
Removing a now antiquated PHP 7 readiness badge and changing note about current implementation to Overview and its content for improved clarity.
Peter Slapansky
committed
Moving more information into Overview in the readme file.
Peter Slapansky
committed
Reprecated constants in the Barcode class in favour of those in BarcodeType.
Peter Slapansky
committed
Added strict type declaration and updated code to match.
Peter Slapansky
committed