CLDR 32

Multiple Unicode version support

First tagged release

internal/export/idna: performance improvement

BenchmarkProfile before 480 ns, after 323 ns, or about a 33% reduction in running time.

Change-Id: I8edfdecc2e7a4fdf7ae25e9af9ce227183187f0b
Reviewed-on: https://go-review.googlesource.com/63794
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>