1.2.0

It's Mitt's first release since 2017! That's the thing about a 200 byte library - there's not a lot of code here to necessitate constant updates. Take it as a sign of stability.

This release is primarily an improvement to the TypeScript definition we ship with Mitt:

• You can now invoke mitt() with or without new in TypeScript (#60/#67 - thanks @davidkpiano)
• .on('*', handler) now has types that pass the correct (event, data) arguments (#76, thanks @zbuttram)
• The optional all parameter, which lets you pass your own mapping of handler Arrays to Mitt, now has correct types (#73, thanks @jesperzach)