Fix Electrum

adding make-protobuf

helpers/make-electrum

 #!/bin/sh
 #
-#    Copyright (C) 2019 Ruben Rodriguez <ruben@trisquel.info>
+#    Copyright (C) 2021 Ruben Rodriguez <ruben@trisquel.info>
 #
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -20,7 +20,7 @@
 VERSION=1
 EXTERNAL='deb-src http://ftp.debian.org/debian testing main'
 REPOKEY=648ACFD622F3D138
-DEPENDS=aiorpcx,aiohttp-socks
+DEPENDS=aiorpcx,aiohttp-socks,protobuf
 
 . ./config