blog: add go1.6 post

By Andrew but added by me.

Change-Id: I691657dd8464f47985d1235a0afa7fba12f06675
Reviewed-on: https://go-review.googlesource.com/19581
Reviewed-by: Chris Broadfoot <cbro@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
1 file changed