Tweaked minimum versions#2

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GrahamCampbell wants to merge 2 commits intoacrobat:allow-php8from

GrahamCampbell:patch-1

Commits on Nov 12, 2020

Allow PHP8 and switch psr cache dev dependency to symfony/cache to allow php8 testing
acrobat
committed

Commits on Nov 28, 2020

Tweaked minimum versions
GrahamCampbell
authored