chore: add missing field

Resolves DISCATSHARP-2EP
Resolves DISCATSHARP-2EN

DisCatSharp/Entities/Message/DiscordMessage.cs

@@ -153,6 +153,7 @@ internal DiscordMessage(DiscordMessage other)
 
 		this.Poll.ChannelId = this.ChannelId;
 		this.Poll.MessageId = this.Id;
+		this.ChannelType = other.ChannelType;
 	}
 
 	/// <summary>
@@ -165,6 +166,12 @@ public DiscordChannel Channel
 		internal set => this._channel = value;
 	}
 
+	/// <summary>
+	///     Gets the type of the <see cref="Channel" /> this message was send in.
+	/// </summary>
+	[JsonProperty("channel_type", NullValueHandling = NullValueHandling.Ignore)]
+	public ChannelType ChannelType { get; internal set; }
+
 	/// <summary>
 	///     Gets the thread in which the message was sent.
 	/// </summary>
@@ -502,7 +509,10 @@ public async Task<DiscordMessage> EndPollAsync()
 	/// </summary>
 	/// <param name="targetChannel">The channel to forward this message to.</param>
 	/// <param name="content">Content is not available at the moment, but already added for the future.</param>
-	/// <exception cref="UnauthorizedException">Thrown when the bot tries forwarding a message it doesn't has access to or the client tried to modify a message not sent by them.</exception>
+	/// <exception cref="UnauthorizedException">
+	///     Thrown when the bot tries forwarding a message it doesn't has access to or the
+	///     client tried to modify a message not sent by them.
+	/// </exception>
 	/// <exception cref="NotFoundException">Thrown when the target channel does not exist.</exception>
 	/// <exception cref="BadRequestException">Thrown when an invalid parameter was provided.</exception>
 	/// <exception cref="ServerErrorException">Thrown when Discord is unable to process the request.</exception>