Private and Public channels unification

README.md

@@ -45,7 +45,7 @@ TelegramSender::sendMessage(Bot $bot, Channel $channel, string $message, ParseMo
 
 Messages support __HTML__ and __Markdown__ depending on the `$parseMode` arguemnt's value.
 
-`$channel` must be an instance of `PublicChannel` or `PrivateChannel`.
+`$channel` must be an instance of `PublicChannel` or `PrivateChannel` (this is future-proof mechanism as for some methods which are not yet implemented it matters).
 
 Example:
 ```php

src/PublicChannel.php

@@ -5,15 +5,7 @@
 /**
  * Representation of a public channel.
  */
-class PublicChannel extends Channel
+class PublicChannel extends PrivateChannel
 {
-    /**
-     * Returns the channel key, for public channels it is equal to channel id.
-     *
-     * @return int
-     */
-    public function getChannelKey() : int
-    {
-        return $this->channelId;
-    }
+
 }