Links are incorrect

[Amndeep7]

There are a few links in README.md that lead to 404s. During a talk with @mpilquist, it turns out that it's most probably due to rename of master to series/1.x.

An example of a 404-ing link is https://github.com/scodec/scodec-stream/blob/master/src/main/scala/scodec/stream/decode/StreamDecoder.scala, which is what scodec.stream.StreamDecoder[A] links to in the Guide section.

There is an example of a fixed link in this commit: 387fe66

[Amndeep7]

Another instance of a link being incorrect: in the sentence "See the API docs for more details.", the link goes to a google search for scodec stream API, which I guess works, but it could instead directly link to the API.