Assert::positiveInteger

[marcosh]

Aas far as I understand, at the moment to assert that a variable contains a positive integer I need to use two assertions

Assert::integer($a, '...');
Assert::greaterThanEq($a, 0, '...');

Would it make sense to create a new assertion to condense these two in a single call? It could be called something like Assert::natural()

[Nyholm]

👍 if you think it is a common use case.

[Nyholm]

Closed by #35