Add email support to Cani

[Sidney Liebrand]

The author of caniemail.com has implemented a JSON format for its data and also implemented a JSON api call:

issue: hteumeuleu/caniemail#30
json url: https://www.caniemail.com/api/data.json

Idea here is to allow cani to also query email support instead of "just" caniuse.
If you're reading this and like the idea, please give a star to: https://github.com/hteumeuleu/caniemail :)