Test parsing of package NAME VERSION syntax

refs https://github.com/CPAN-API/metacpan-web/issues/906
and  https://rt.cpan.org/Ticket/Display.html?id=87782
Stringify module version more defensively

String concatenation should produce the same result as version->stringify
but it also works for when a string is returned (instead of an object).

This is a work-around for https://rt.cpan.org/Ticket/Display.html?id=87782.

Closes CPAN-API/metacpan-web#906.