change the meta tag name

[shoaibsharif]

Hi,
First of all, thank you for this npm package. It actually helps me a lot. While I was working on a project, I have noticed it has a tiny issue when I tried to get og:image from head. Upon researching, I have found that you are trying to find 'meta[name="og:image"]' where I think you should find 'meta[property="og:image"]'.

[rocktimsaikia]

That's a valid issue but some sites do attach the Social image with the name attribute. So we can check for the property attribute first if not present the fallback to the name attribute.

PRs welcome.