TypeScript support

[panuhorsmalahti]

gulp-tslint needs TypeScript support for npmjs.org, which uses atom/highlights (at least used to use according to npmjs.org blog).

See my comment here: panuhorsmalahti/gulp-tslint#112 (comment)

Should be straightforward to add I think.

[adriengibrat]

Thanks for adding typescript support!
Could @as-cii publish 3.1.0 on npm?
In the meantime

cd node_modules
git clone https://github.com/atom/highlights.git
cd highlight
npm install
npm run pretest
npm run prepublish
cd ../..

do the trick ;)