internal/dl: add heschi to validUser

Change-Id: I9db12489e940dcc7444801f9337e1564bab382d4
Reviewed-on: https://go-review.googlesource.com/c/website/+/326569
Trust: Heschi Kreinick <heschi@google.com>
Run-TryBot: Heschi Kreinick <heschi@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/internal/dl/dl.go b/internal/dl/dl.go
index 2ef1c9a..d986421 100644
--- a/internal/dl/dl.go
+++ b/internal/dl/dl.go
@@ -337,7 +337,7 @@
 // Go release binaries via the /dl/upload endpoint.
 func validUser(user string) bool {
 	switch user {
-	case "amedee", "cherryyz", "dmitshur", "drchase", "katiehockman", "mknyszek", "rakoczy", "valsorda":
+	case "amedee", "cherryyz", "dmitshur", "drchase", "heschi", "katiehockman", "mknyszek", "rakoczy", "valsorda":
 		return true
 	}
 	return false