Fix the errors

src/core/requests/get_file.rs

@@ -40,7 +40,7 @@ impl<'a> GetFile<'a>{
         where
             T: Into<String>,
     {
-        self.file_id = message_id.into();
+        self.file_id = file_id.into();
         self
     }
 }

src/core/requests/send_chat_action.rs

@@ -1,6 +1,5 @@
 use crate::core::network;
 use crate::core::requests::{ChatId, Request, RequestContext, RequestFuture, ResponseResult};
-use crate::core::types::Message;
 
 ///Use this method when you need to tell the user that something is happening on the bot's side.
 ///The status is set for 5 seconds or less (when a message arrives from your bot, Telegram clients clear its typing status).