Implemented the AmiiboRelease model.

Sources/Models/AmiiboRelease.swift

@@ -0,0 +1,21 @@
+import Foundation
+
+extension Amiibo {
+    public struct Release {
+        public let australia: Date?
+        public let europe: Date?
+        public let japan: Date?
+        public let america: Date?
+    }
+}
+
+// MARK: - Decodable
+
+extension Amiibo.Release: Decodable {
+    enum CodingKeys: String, CodingKey {
+        case australia = "au"
+        case europe = "eu"
+        case japan = "jp"
+        case america = "na"
+    }
+}