:bug: Fix RtMidi.send

diff --git a/plug b/plug
index 17e07dcbcb6f0481bd8848b1c029ff7ba949dab6..0c63e8ae030d80ddf9cf1615aeab20c080074cd9 160000 (submodule)
--- a/plug
+++ b/plug
@@ -1 +1 @@
-Subproject commit 17e07dcbcb6f0481bd8848b1c029ff7ba949dab6
+Subproject commit 0c63e8ae030d80ddf9cf1615aeab20c080074cd9