Remove in-place edits and return fresh instances instead

Fixes #4098

discord/role.py

@@ -351,7 +351,7 @@ class Role(Hashable):
         mentionable: bool = MISSING,
         position: int = MISSING,
         reason: Optional[str] = MISSING,
-    ) -> None:
+    ) -> Optional[Role]:
         """|coro|
 
         Edits the role.
@@ -364,6 +364,9 @@ class Role(Hashable):
         .. versionchanged:: 1.4
             Can now pass ``int`` to ``colour`` keyword-only parameter.
 
+        .. versionchanged:: 2.0
+            Edits are no longer in-place, the newly edited role is returned instead.
+
         Parameters
         -----------
         name: :class:`str`
@@ -391,11 +394,14 @@ class Role(Hashable):
         InvalidArgument
             An invalid position was given or the default
             role was asked to be moved.
-        """
 
+        Returns
+        --------
+        :class:`Role`
+            The newly edited role.
+        """
         if position is not MISSING:
             await self._move(position, reason=reason)
-            self.position = position
 
         payload: Dict[str, Any] = {}
         if color is not MISSING:
@@ -420,7 +426,7 @@ class Role(Hashable):
             payload['mentionable'] = mentionable
 
         data = await self._state.http.edit_role(self.guild.id, self.id, reason=reason, **payload)
-        self._update(data)
+        return Role(guild=self.guild, data=data, state=self._state)
 
     async def delete(self, *, reason: Optional[str] = None) -> None:
         """|coro|