fix: fix tests

fix: add support links without scheme (//)

build: min php version is 8.0.2

fix: support https://html.spec.whatwg.org/#valid-navigable-target-name …

…for target attribute

#5

fix: add type hints

#4

build: add badge for github actions

fixes for php 7.4

minor improvements

Merge pull request #3 from StudioMaX/patch-2

Некорректная проверка Tag::BEHAVIOUR для тегов table/tr/ul

не используем функцию each, т.к. она deprecated (http://php.net/each)