Add support for function-bind operator e.g. func::bind(this)

[jayphelps]

The function-bind operator is a proposed addition to JavaScript that is supported by Babel and is a great use case for a utility like this.

func::bind(this);
// is functionally equivalent to
bind.call(func, this);

[azu]

@jayphelps Thanks for pull request! I'll merge feature after you have fixed the comment https://github.com/azu/idempotent-bind/pull/1/files#r64170110

[jayphelps]

@azu Done.

[azu]

Thanks. publish 1.1.0