add support for Solidity language

[znwhite]

trafficstars

It would be great if one of the languages we can pass is "sol" or "solidity". Solidity syntax highlighting would come in really handy for a blog post I am currently writing. Thanks!

[PaulRBerg]

Commenting to cast my support. As of writing this comment, Solidity is among the fastest-growing programming language in the world.

[nicochatzi]

PrismJS has solidity syntax 🎉 You can add it by following the steps in the FAQ