Update TelegramUpdate with all message values

Sources/VaporTelegramBot/Api/TelegramUpdate.swift

@@ -16,21 +16,73 @@ public final class TelegramUpdate: TelegramJSONConvertible {
     public struct Keys: TelegramJSONConvertibleKeys {
 
         public static let updateIdKey = "update_id"
+        public static let messageKey = "message"
+        public static let editedMessageKey = "edited_message"
+        public static let channelPostKey = "channel_post"
+        public static let editedChannelPostKey = "channel_post"
     }
 
     // MARK: - Primitive types
 
+    /// The update‘s unique identifier. Update identifiers start from a certain positive number
+    /// and increase sequentially. This ID becomes especially handy if you’re using Webhooks,
+    /// since it allows you to ignore repeated updates or to restore the correct update sequence,
+    /// should they get out of order.
     public var updateId: Int
 
+    /// Optional. New incoming message of any kind — text, photo, sticker, etc.
+    public var message: TelegramMessage?
+
+    /// Optional. New version of a message that is known to the bot and was edited
+    public var editedMessage: TelegramMessage?
+
+    /// Optional. New incoming channel post of any kind — text, photo, sticker, etc.
+    public var channelPost: TelegramMessage?
+
+    /// Optional. New version of a channel post that is known to the bot and was edited
+    public var editedChannelPost: TelegramMessage?
+
     public init(json: JSON) throws {
         self.updateId = try json.get(Keys.updateIdKey)
+
+        if let messageJson = json[Keys.messageKey] {
+            self.message = try TelegramMessage(json: messageJson)
+        }
+
+        if let editedMessageJson = json[Keys.editedMessageKey] {
+            self.editedMessage = try TelegramMessage(json: editedMessageJson)
+        }
+
+        if let channelPostJson = json[Keys.channelPostKey] {
+            self.channelPost = try TelegramMessage(json: channelPostJson)
+        }
+
+        if let editedChannelPostJson = json[Keys.editedChannelPostKey] {
+            self.editedChannelPost = try TelegramMessage(json: editedChannelPostJson)
+        }
     }
 
     public func makeJSON() throws -> JSON {
         var json = JSON()
 
         try json.set(Keys.updateIdKey, updateId)
 
+        if let message = message {
+            try json.set(Keys.messageKey, message)
+        }
+
+        if let editedMessage = editedMessage {
+            try json.set(Keys.editedMessageKey, editedMessage)
+        }
+
+        if let channelPost = channelPost {
+            try json.set(Keys.channelPostKey, channelPost)
+        }
+
+        if let editedChannelPost = editedChannelPost {
+            try json.set(Keys.editedChannelPostKey, editedChannelPost)
+        }
+
         return json
     }
 }