Feature: boxed preview without an image, for non-OG links

[mostafa]

Hi @ysk24ok,

I've added a feature to include a boxed preview of the link, just like in Medium, to your library, and done some cleanups.
Usage:

• I've also used it extensively in my blog: https://mostafa.dev/blog/api-backend-security
• https://twitter.com/MosiMoradian/status/1267041567862333450

Issue: And found out that some websites block traffic to metainspector, so it fails to fetch data.

Suggestion: it would be good if we cache the images.

[ysk24ok]

Thank you for this PR and sorry for the late reply.
It seems this change breaks tests, could you please let the tests pass?
https://travis-ci.org/github/ysk24ok/jekyll-linkpreview/builds/694973845 (I'm not sure you can see this page.)
You can run tests by bundle exec rake test in your local environment before git push.

[mostafa]

Hey @ysk24ok,
I wrote a test to check if everything works as expected. It works, but I have changed the focus of the test from fetch to get, since fetch now returns a new metainspector object, rather than meta_tags.

[ysk24ok]

Thank you for the quick fix, @mostafa .
I tried this feature in a new Jekyll site and confirmed it worked correctly.
But one question, why are there two NonOpenGraphProperties classes?

[mostafa]

You're welcome! 🙂
I have merged things back and forth, and it slipped out of my hand. I'll fix it.

[ysk24ok]

LGTM. Thank you for the pull request!