Add depreciation notice for attribute rename

Author: LilSpazJoekp

discord_slash/context.py

@@ -1,5 +1,7 @@
 import typing
 import asyncio
+from warnings import warn
+
 import discord
 from contextlib import suppress
 from discord.ext import commands
@@ -62,6 +64,26 @@ def __init__(self,
         else:
             self.author = discord.User(data=_json["user"], state=self.bot._connection)
 
+    @property
+    def _deffered_hidden(self):
+        warn("`_deffered_hidden` as been renamed to `_deferred_hidden`.", DeprecationWarning, stacklevel=2)
+        return self._deferred_hidden
+
+    @_deffered_hidden.setter
+    def _deffered_hidden(self, value):
+        warn("`_deffered_hidden` as been renamed to `_deferred_hidden`.", DeprecationWarning, stacklevel=2)
+        self._deferred_hidden = value
+
+    @property
+    def deffered(self):
+        warn("`deffered` as been renamed to `deferred`.", DeprecationWarning, stacklevel=2)
+        return self.deferred
+
+    @deffered.setter
+    def deffered(self, value):
+        warn("`deffered` as been renamed to `deferred`.", DeprecationWarning, stacklevel=2)
+        self.deferred = value
+
     @property
     def guild(self) -> typing.Optional[discord.Guild]:
         """