Small typo in the readme

In the readme.md, in the examples part there is a small typo where an Array is defined with generic type:

```
var items:Array<String> = ["my.product.id1", "my.product.id2", "my.product.id3"];
var subs:Array<String> = ["my.subs.id1", "my.subs.id2", "my.subs.id3"];
```

Type definition should be removed.
