Update README.md

[DenisIzmaylov]

No description provided.

[gaearon]

I don't mind omitting parens when there is a single argument.

Do you folks think it reads better?

[emmenko]

I would also prefer no brackets for only one argument

[DenisIzmaylov]

Yes, I think it's more readable for almost people.
But we can vote in the community.
I fixed it according https://github.com/airbnb/javascript#arrow-functions which is basically using is default code style. Or do you prefer other?

[gaearon]

Let's go with Airbnb's style guide. But if we do that, I'd like to see eslint configuration to enforce as much of it as possible, and also update the source code.

[gaearon]

Closing in favor of #97.