Two more tags for jekyll-schollar

Hi!

First of all thank you for making this jekyll plugin!

I have forked your awesome work and added two more tags which I find (and some people namely arademaker https://github.com/arademaker/) that can be usefull.

I tested and deployed this code locally.
See my tests here: 
http://high-sunrise-2020.herokuapp.com/

Please do not hesitate in contacting me for modifications and corrections.

Thank you in advance.