Dist enhancements

Hi!

Below are some improvements for your distribution. In particular, META_MERGE addition would allow for meta information to show up nicely on [MetaCPAN](https://metacpan.org/) (for example, as [here](https://metacpan.org/pod/Try::Tiny)).

Feel free to ask question about these changes, if you'll have any.

Cheers!
I assume you mean `WWW::HKP->new`