feat: Add ReleaseCountry to ID3V2_MAP

Author: UnknownSuperficialNight

lofty/src/id3/v2/tag.rs

@@ -1420,6 +1420,7 @@ impl MergeTag for SplitTagRemainder {
 			ItemKey::MusicBrainzArtistId,
 			ItemKey::MusicBrainzReleaseArtistId,
 			ItemKey::MusicBrainzWorkId,
+			ItemKey::ReleaseCountry,
 		] {
 			let frame_id = item_key.map_key(TagType::Id3v2).expect("valid frame id");
 			if let Some(text) = join_text_items(&mut tag, [item_key]) {

lofty/src/tag/item.rs

@@ -230,7 +230,8 @@ gen_map!(
 	"MusicBrainz Release Group Id"          => MusicBrainzReleaseGroupId,
 	"MusicBrainz Artist Id"                 => MusicBrainzArtistId,
 	"MusicBrainz Album Artist Id"           => MusicBrainzReleaseArtistId,
-	"MusicBrainz Work Id"                   => MusicBrainzWorkId
+	"MusicBrainz Work Id"                   => MusicBrainzWorkId,
+	"MusicBrainz Album Release Country" 	=> ReleaseCountry
 );
 
 gen_map!(