fix changelog: s/raring/unstable/
fix changelog: s/raring/unstable/

bdwalton/debian-golang,tianon/debian-golang,nightlyone/golang,nightlyone/golang,tianon/debian-golang,tianon/debian-golang,bdwalton/debian-golang,bdwalton/debian-golang,bdwalton/debian-golang,tianon/debian-golang,tianon/debian-golang,tianon/debian-golang,nightlyone/golang,bdwalton/debian-golang,bdwalton/debian-golang,tianon/debian-golang,bdwalton/debian-golang,bdwalton/debian-golang,nightlyone/golang,nightlyone/golang,nightlyone/golang,nightlyone/golang,tianon/debian-golang