git-codereview: add mail -trybot flag

This flag sets the Run-TryBot+1 label when uploading a CL.

Change-Id: I46d14733e0d23c8f40198b0bf670c266ef05db16
Reviewed-on: https://go-review.googlesource.com/17053
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed