Add a token attribute to the bot

Author: scomarlf

library/src/main/java/com/pengrad/telegrambot/TelegramBot.java

@@ -24,6 +24,7 @@
  */
 public class TelegramBot {
 
+    private final String token;
     private final TelegramBotClient api;
     private final FileApi fileApi;
     private final UpdatesHandler updatesHandler;
@@ -33,6 +34,7 @@ public TelegramBot(String botToken) {
     }
 
     TelegramBot(Builder builder) {
+        this.token = builder.botToken;
         this.api = builder.api;
         this.fileApi = builder.fileApi;
         this.updatesHandler = builder.updatesHandler;
@@ -46,6 +48,10 @@ public <T extends BaseRequest<T, R>, R extends BaseResponse> void execute(T requ
         api.send(request, callback);
     }
 
+    public String getToken() {
+        return token;
+    }
+
     public String getFullFilePath(File file) {
         return fileApi.getFullFilePath(file.filePath());
     }