Fix CS

Author: ondrejmirtes

src/Type/Php/RangeFunctionReturnTypeExtension.php

@@ -22,6 +22,7 @@
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
 use PHPStan\Type\UnionType;
+use function abs;
 use function count;
 use function range;