Rename IReaderBase.peak() to peek()

[knutwannheden]

I noticed that IReaderBase and subtypes define a method called peak(), which probably more appropriately would be called peek(). Although I don't know what the backwards compatibility strategy is for this library, so I thought I would just create an issue for this rather than a PR. Also, I am aware that there are already downstream libraries like json-pack which build on this. Maybe it would make most sense to just deprecate peak().

Background: While in search for a good CBOR library that fits my requirements (allow for synchronous calls as well as low-level SAX-style event processing) I stumbled across json-pack, which fits my bill very nicely. I had a bit of a hard time figuring out how to use it properly, as documentation is very sparse. In the context of a Node application I figured the easiest way to decode CBOR is to construct a new CborDecoder and then call decoder.reader.reset(buffer) on it.