Fix implementation of fn every

[lrusso96]

I think there is a typo in this example: the switch clause is wrong.
Check the code on an array of integers all greater than 2 and the result would be false as well.

OK/README.md

Lines 381 to 391 in d150075

	```go
	let every = fn(arr, check) {
	let passed = true;
	map(arr, fn(e) {
	switch check(e) { case true: passed = false; } }
	)
	return passed;
	};
	result = every([5,2,4,1,3], fn(e) { return e >= 2 }); // false
	```

[jesseduffield]

good catch!

[jesseduffield]

To keep things simple I would just leave this bit as it was

[jesseduffield]

Thanks for making this. Just one thing

[lrusso96]

I close this as explained in #19.