Typescript support

[enaluz]

Curious on everyone's thoughts on supporting types for this library-- useful, or not useful? I'm using this project for something I'm building, and having more type security would be nice. Happy to take a crack at it if anyone's interested! I'm also looking into seeing how we could use @types/draft-js to do this.

[danawoodman]

Useful. Would like to have a @types/medium-draft or similar package to define types rather than just setting to any like I'm doing now