Added migration docs

docs/index.rst

@@ -19,6 +19,12 @@ Contents:
    
 .. _docs:
 
+.. toctree::
+   :maxdepth: 1
+   :caption: General
+
+   migrating
+
 .. toctree::
    :maxdepth: 1
    :caption: Channel Documentation

docs/migrating.rst

@@ -0,0 +1,27 @@
+.. include:: ./vars.rst
+
+Updating to v5.0.0
+==================
+
+If you're coming from versions below v5, you might find some changes. Here are the major changes:
+
+--------
+
+Change 1
+--------
+
+--------
+
+.. code-block:: js
+
+	// OLD:
+	
+	client.getUser();
+	client.getServer();
+	server.getMember(); // etc etc
+	
+	// NEW:
+	
+	client.users.get();
+	client.servers.get();
+	client.members.get();