add PHP 8 support#508

Merged

theofidry merged 8 commits intobox-project:masterfrom

Dec 18, 2020

Commits on Dec 15, 2020

add PHP 8 support
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upgrade beberlei/assert to 3.3.0
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rework build workflow
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use threads option for infection
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Commits on Dec 18, 2020

fix tests
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fix signing tests on php 8
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fix phar diff on php 8
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fix sorting order
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