git-review: allow mail with multiple -r and -cc flags

They accumulate, like they do in other standard git commands.

Fixes golang/go#9241.

Change-Id: I48e72ff1561cd34c194ebf6dfbc5176a33f4a2d6
Reviewed-on: https://go-review.googlesource.com/1442
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
1 file changed
tree: c52951419ab11b20a2e59888a0e8f9738ee3b2de
  1. README
  2. git-review/