Add support for async / await syntax on the javascript editor

[lcrespilho]

Hi Kyle. Thanks a lot for the extension. It's amazing. :)

Can you please add support for the async/await syntax sugar on the javascript code editor?
If one clicks "Beautify JS" on the code editor the code is formatted in a way that the code breaks. For example:

code before beautification:

async function foo() {}

code after beautification:

async
function foo() {}

The resulted javascript breaks when injected.

Thanks a lot.