I wouldn't bother with such ancient perls but your tests on 5.10 and 5.10.1 fail because your code is looking for a newer version of Test::More than the version installed. Your failing tests on 5.14, 5.16, and 5.18 are all failures to find HTTP::Tiny 0.083 or better. Your module itself fails to load so $WWW::Crawl::VERSION is never defined.

I haven't used ExtUtils::MakeMaker since the days of Module::Build and perl 5.10 but there should be support for a cpanfile to manage these prerequisites by now. If you're new, I would suggest you switch to Module::Build/Module::Build::Tiny and Minilla to manage it all. Some of your author tests are automatically generated and run by Minilla instead of stashing them in the dist itself. Minilla would have also generated your missing LICENSE file. Could also generate a README.md based on your pod, tidy the code and pod, run spellcheck, make sure your version number is updated before release, tag the releases in git, etc. Really speeds up the entire process of managing a small distribution.

Before your next release, don't forget to add a LICENSE, delete the misplaced test /01-html.t in the base directory, and fix the typo on line 170 of /lib/WWW/Crawl.pm (itial => initial). :)