doc: add go1.1.1 to the release notes
doc: add go1.1.1 to the release notes

R=golang-dev, iant
CC=golang-dev
https://codereview.appspot.com/10236045

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang