Document PHPUnit 13 built‑in consecutive argument methods

[zonuexe]

PHPUnit 13 now provides withParameterSetsInOrder(), so users on 13+ can rely on the built-ins.

 $mock
     ->expects(self::exactly(2))
     ->method('someMethod')
-    ->with(
-        ...ConsecutiveArguments::of(
+    ->withParameterSetsInOrder(
         ['1.1', '1.2'],
         ['2.1', '2.2'],
-        )
     );

This update adds a README note explaining when those native methods are preferred and when this package remains useful for projects that must also support PHPUnit 10–12.