query without '=' is form too

[yakunink]

Hello,

This pull request fixes issue #34.

Happy hacktoberfest!

[oalders]

Thanks for this! I see that you did add an additional test. Would you be able to add a test specifically for https://example.com/?foo and add a comment? The tests cases as they currently stand are light on documentation. :)

[oalders]

Thanks @yakunink. LGTM.

[skaji]

Before this PR, query_form() and query_keywords() are mutually exclusive;
i.e, if query_form() returns a non-empty list, then query_keywords() returns an empty list, and vice versa.

I think Web::Request expect this behavior.
https://grep.metacpan.org/search?size=20&q=query_keywords
https://metacpan.org/source/DOY/Web-Request-0.11/lib/Web/Request.pm#L225-228

That is, this PR may break some existing perl code which uses URI module.
Sorry, this was an overstatement.

I'm just not sure what query_form() should return for http://example.com/?foo+bar.

[yakunink]

From this html-book chapter Creating Searchable Documents and this article The History of the URL seems that keywords used to send search queries. I think separating search query phrase into words inside URI object is not good idea.
So I would prefer to get { 'foo bar' => '' } from query_form() as it works now.