Support for 2.18.1 #104

Job	Run time
PHPUnit tests (lowest, 7.4, ubuntu-latest)	10s
PHPUnit tests (lowest, 7.4, windows-latest)	8s
PHPUnit tests (lowest, 8.0, ubuntu-latest)	1s
PHPUnit tests (lowest, 8.0, windows-latest)	1s
PHPUnit tests (lowest, 8.1, ubuntu-latest)	1s
PHPUnit tests (lowest, 8.1, windows-latest)	1s
PHPUnit tests (lowest, 8.2, ubuntu-latest)	1s
PHPUnit tests (lowest, 8.2, windows-latest)	1s
PHPUnit tests (highest, 7.4, ubuntu-latest)	14s
PHPUnit tests (highest, 7.4, windows-latest)	13s
PHPUnit tests (highest, 8.0, ubuntu-latest)	8s
PHPUnit tests (highest, 8.0, windows-latest)	12s
PHPUnit tests (highest, 8.1, ubuntu-latest)	11s
PHPUnit tests (highest, 8.1, windows-latest)	10s
PHPUnit tests (highest, 8.2, ubuntu-latest)	11s
PHPUnit tests (highest, 8.2, windows-latest)	11s
PHPUnit tests (locked, 7.4, ubuntu-latest)	10s
PHPUnit tests (locked, 7.4, windows-latest)	16s
PHPUnit tests (locked, 8.0, ubuntu-latest)	9s
PHPUnit tests (locked, 8.0, windows-latest)	11s
PHPUnit tests (locked, 8.1, ubuntu-latest)	8s
PHPUnit tests (locked, 8.1, windows-latest)	11s
PHPUnit tests (locked, 8.2, ubuntu-latest)	9s
PHPUnit tests (locked, 8.2, windows-latest)	9s
	3m 17s

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