[Autoroll] Fix broken github comparision link

Change-Id: I55cb2360287c8637721dcc33ac94849990a5dcd6
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/218967
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
diff --git a/autoroll/go/repo_manager/github_deps_repo_manager.go b/autoroll/go/repo_manager/github_deps_repo_manager.go
index 3129520..5aa430f 100644
--- a/autoroll/go/repo_manager/github_deps_repo_manager.go
+++ b/autoroll/go/repo_manager/github_deps_repo_manager.go
@@ -238,7 +238,7 @@
 		return 0, err
 	}
 	logStr = strings.TrimSpace(logStr)
-	childRepoCompareURL := fmt.Sprintf("%s/%%2Blog/%s..%s", rm.childRepoUrl, from[:12], to[:12])
+	childRepoCompareURL := fmt.Sprintf("%s/compare/%s..%s", rm.childRepoUrl, from[:12], to[:12])
 	commitMsg, err := GetGithubCommitMsg(logStr, childRepoCompareURL, rm.childPath, from, to, rm.serverURL, logCmd, emails)
 	if err != nil {
 		return 0, fmt.Errorf("Could not build github commit message: %s", err)