scripts/genproto: use protoc 3.6.0

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

scripts/genproto.sh

@@ -10,8 +10,8 @@ if ! [[ "$0" =~ scripts/genproto.sh ]]; then
 	exit 255
 fi
 
-if [[ $(protoc --version | cut -f2 -d' ') != "3.5.1" ]]; then
-	echo "could not find protoc 3.5.1, is it installed + in PATH?"
+if [[ $(protoc --version | cut -f2 -d' ') != "3.6.0" ]]; then
+	echo "could not find protoc 3.6.0, is it installed + in PATH?"
 	exit 255
 fi