Update README.md

[kamil-kielczewski]

create multi-arguments functions

[hazzik]

If you want even more arguments for less characters you can do following:

"return(" + []["slice"]["call"](false+"") + ")=>f+t"

[aemkei]

Well, that is a nice hack to allow multiple args.

[kamil-kielczewski]

@hazzik Finally I add info about optimization trick which is very clever