Update README zipAsArray example code

I'm new to Bacon.js and was reading through the docs and came across [Bacon.zipAsArray](https://github.com/baconjs/bacon.js#bacon-zipasarray) function and its example: 

```coffee
x = Bacon.fromArray([1,2,3])
y = Bacon.fromArray([10, 20, 30])
z = Bacon.fromArray([100, 200, 300])
Bacon.zipAsArray(x, y, z)

# produces values 111, 222, 333
```

The example seems to be misleading, and has wrong output. Correct me if I'm wrong, but what I think that this function produces (and I checked with `.log()`) is three values, arrays of `[1, 10, 100]`, `[2, 20, 200]` and `[3, 30, 300]`. Am I correct?