Return the extended solc version from `truffle version`

[masonforest]

Hey truffle team,

Thanks for all you do for the community!

I was trying to find the exact version of solc truffle was using so I could upload my contract metadata to swarm. I ran into this answer on stack exchange but that seemed sort of hacky.

Let me know if there's a better way to do this.

Thanks again!

-Mason