project.config: permit gopherbot to edit topics

Approvers can edit topics, and gopherbot needs to be able to too
if it wants to help correct mistakes (CL 588195). We didn't grant
this access previously because it was unused.

Change-Id: Icbdc9a84d15da1e0d5499e5fe5ad451e2c9b942b
Reviewed-on: https://go-review.googlesource.com/c/All-Projects/+/588138
Reviewed-by: Roland Shoemaker <roland@golang.org>

project.config

diff --git a/project.config b/project.config
index 9721b14..d577adc 100644
--- a/project.config
+++ b/project.config
@@ -30,6 +30,7 @@
 	submit = group gobot
 	submit = group luci_scoped_account
 	editTopicName = group cria/project-golang-approvers
+	editTopicName = group gobot
 	editHashtags = group cria/project-golang-approvers
 	editHashtags = group gobot
 	removeReviewer = group cria/project-golang-approvers