blog: remove "Errors are values" post

The GothamGo post needs to go out first.
If we push with this in the repo, it'll appear early.

Change-Id: Ifb4093f948e10ffdde1ec278f66195324b398f2d
Reviewed-on: https://go-review.googlesource.com/2538
Reviewed-by: Rob Pike <r@golang.org>
1 file changed