add a midi meta event 0x21: midi port (#147)

* add a midi meta event 0x21: midi port

The meta event 0x21 was missing in the dict: MIDI_EVENTS_DEFS. For some midi files with this meta event, there would be a load error. So, I
 add 0x21 into it.

* increment the patch version

Project.toml

@@ -1,7 +1,7 @@
 name = "MIDI"
 uuid = "f57c4921-e30c-5f49-b073-3f2f2ada663e"
 repo = "https://github.com/JuliaMusic/MIDI.jl.git"
-version = "2.0.1"
+version = "2.0.2"
 
 [deps]
 FileIO = "5789e2e9-d7fb-5bc7-8068-2c6fae9b9549"

src/events.jl

@@ -24,6 +24,12 @@ const MIDI_EVENTS_DEFS = Dict(
         decode = :(Int.(data)),
         encode = :(UInt8(event.channel))
     ),
+    0x21 => (
+        type = :MIDIPort,
+        fields = ["channel::Int"],
+        decode = :(Int.(data)),
+        encode = :(UInt8(event.channel))
+    ),
     0x2F => (
         type = :EndOfTrackEvent,
         fields = [],
@@ -395,4 +401,4 @@ The `PitchBendEvent` informs a MIDI device to modify the pitch in a specific cha
 * `status::UInt8` : The status byte of the event.
 * `pitch::Int` : Value of the pitch bend.
 """
-PitchBendEvent
+PitchBendEvent