Implemented #3 and made some improvements for #8 and #1

classes/errors/pycord_user.py

@@ -1,7 +1,8 @@
 class UserNotFoundError(Exception):
     """PycordUser could not find user with such an ID in the database"""
 
-    def __init__(self, user_id: int) -> None:
-        self.user_id = user_id
+    def __init__(self, user_id: int, guild_id: int) -> None:
+        self.user_id: int = user_id
+        self.guild_id: int = guild_id
 
-        super().__init__(f"User with id {self.user_id} was not found")
+        super().__init__(f"User with id {self.user_id} was not found in guild {self.guild_id}")