git-codereview: call testMain instead of executing "git codereview ..."

Fixes #9648

Change-Id: I86995c262fee31eb17c1dcb6c9e48fe632b78cf0
Reviewed-on: https://go-review.googlesource.com/6425
Reviewed-by: Russ Cox <rsc@golang.org>
2 files changed
tree: 0517a5e2106fcfcf7a77952284f7c969e2b9bcdd
  1. .gitattributes
  2. CONTRIBUTING.md
  3. README
  4. git-codereview/