Grabbing main repo language and displaying it

[Mordax]

Closes #40. Adds the main repo language to the Repo struct and implements in a display.

[0xazure]

Hey @Mordax this looks like a really great addition!

My only concern is about the formatting, I gave this a whirl and got:

[warner/magic-wormhole](https://github.com/warner/magic-wormhole) - get things from one computer to another, safelyMain Language: Python
[VulnReproduction/LinuxFlaw](https://github.com/VulnReproduction/LinuxFlaw) - This repo records all the vulnerabilities of linux software I have reproduced in my local workspaceMain Language: C

note the lack of space between the end of the repo description and "Main Language".

The language information looks a bit lonely hanging off the end there, what if we integrated it a bit more by putting it before the description, maybe in some brackets instead of labeling it?

[warner/magic-wormhole](https://github.com/warner/magic-wormhole) (Python) - get things from one computer to another, safely
[VulnReproduction/LinuxFlaw](https://github.com/VulnReproduction/LinuxFlaw) (C) - This repo records all the vulnerabilities of linux software I have reproduced in my local workspace

which, as Markdown, would render like this:

warner/magic-wormhole (Python) - get things from one computer to another, safely
VulnReproduction/LinuxFlaw (C) - This repo records all the vulnerabilities of linux software I have reproduced in my local workspace