api: update go1.txt after adding functions to html/template Fixes build, teaches lesson.
api: update go1.txt after adding functions to html/template
Fixes build, teaches lesson.

R=golang-dev, r
TBR=bradfitz
CC=golang-dev
http://codereview.appspot.com/5853051

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