docs: add migration docs for 4.1

Author: i0bs

docs/migration.rst

@@ -20,6 +20,32 @@ will need it appended as a key-word argument. The example below shows this chang
 
     # 4.0.2
     ...
-    channel = interactions.Channel(**data, _state=bot.http)
+    channel = interactions.Channel(**data, _client=bot.http)
 
 This change was added in favor for being able to use endpoints in an abstracted state.
+
+4.0.2 → 4.1.0
+~~~~~~~~~~~~~~~
+
+``4.1.0`` introduces numerous breaking changes that affect the bot developers' ability to work with mainly modifying
+the way our Gateway processes information, as well as supplying a ``reason`` argument to ``HTTPClient``-based methods.
+
+In this version, you are no longer required to give a ``reason`` for every HTTP request. You can instead send it as an optional,
+which will work to keep any existing modifications of our codebase from breaking.
+
+Additionally, modifying the way information is dispatched from the Gateway must be done like this now:
+
+.. code-block:: python
+
+    class ExtendedWebSocketClient(WebSocketClient):
+        def _dispatch_event(self, event: str, data: dict):
+            super()._dispatch_event(event, data)
+
+            if event != "TYPING_START" and event == "INTERACTION_CREATE":
+                ... # run your special interaction dispatch rules here.
+
+We recommend that working in correspondance with this, you should be making use of our ``interactions.ext`` SDK framework.
+
+A slight, yet another breaking change we made was dundering numerous attributes in our internal models.
+You will now need to refer to the client's HTTP object as ``_http`` instead of ``http``. In order to view
+the full list of these, we highly encourage you to view the documentation readily available.