Report invalid "*" versions

[zoffixznet]

if a module has "*" as version in META file, it should be reported as a meta error. Per: https://irclog.perlgeek.de/perl6-dev/2017-06-16#i_14743456

eveo 	Well, it's using "*" as a version number
TimToady 	that's not really a valid version number; it's a valid version number matcher
TimToady 	wildcards should not be part of the identity of a module; they should only be used where dependencies are being checked

[jonathanstowe]

Sounds sensible to me. I'll try to have a look this evening.

[jonathanstowe]

I'm going to make the test "shouldn't have any '*' as part of the version"

[jonathanstowe]

Okay I didn't leave it till the evening.