cmd/gopherbot: remove superfluous newline from change URL

Within the auto-assign logic, the change URL was constructed
with a newline character at the end. This isn't needed and
caused logs to be harder to read as a result.

Change-Id: Iecf0a0b5488b89e9150af042691439eb507b1642
Reviewed-on: https://go-review.googlesource.com/c/143457
Reviewed-by: Brad Fitzpatrick <[email protected]>

Author: andybons

cmd/gopherbot/gopherbot.go

@@ -1650,7 +1650,7 @@ func (b *gopherbot) assignReviewersToCLs(ctx context.Context) error {
 				return nil
 			}
 
-			changeURL := fmt.Sprintf("https://go-review.googlesource.com/c/%s/+/%d\n", gp.Project(), cl.Number)
+			changeURL := fmt.Sprintf("https://go-review.googlesource.com/c/%s/+/%d", gp.Project(), cl.Number)
 			log.Printf("No reviewers or cc: %s", changeURL)
 			files, err := b.gerrit.ListFiles(ctx, gc.ID(), cl.Commit.Hash.String())
 			if err != nil {