internal/dl: add cherryyz, drchase and mknyszek to validUser

Change-Id: I22025263b8d33e236671748fad9ef46ebc4441d1
Reviewed-on: https://go-review.googlesource.com/c/website/+/305531
Trust: Carlos Amedee <carlos@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
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 a224921..8005ee9 100644
--- a/internal/dl/dl.go
+++ b/internal/dl/dl.go
@@ -332,7 +332,7 @@
 
 func validUser(user string) bool {
 	switch user {
-	case "adg", "bradfitz", "cbro", "andybons", "valsorda", "dmitshur", "katiehockman", "julieqiu", "rakoczy", "amedee":
+	case "adg", "bradfitz", "cbro", "andybons", "valsorda", "dmitshur", "katiehockman", "julieqiu", "rakoczy", "amedee", "cherryyz", "drchase", "mknyszek":
 		return true
 	}
 	return false