Bot API 6.6 (#1139)

* Added basic support of Bot API 6.6

* Update descriptions

* Added StickerFormat enum

* Bump version

* Refresh from docs

* Fixed CommandStart

* Fixed files uploading

* Cover new functionality

* Added changelog

* Update texts

docs/api/methods/get_my_description.rst

@@ -0,0 +1,37 @@
+################
+getMyDescription
+################
+
+Returns: :obj:`BotDescription`
+
+.. automodule:: aiogram.methods.get_my_description
+    :members:
+    :member-order: bysource
+    :undoc-members: True
+
+
+Usage
+=====
+
+As bot method
+-------------
+
+.. code-block::
+
+    result: BotDescription = await bot.get_my_description(...)
+
+
+Method as object
+----------------
+
+Imports:
+
+- :code:`from aiogram.methods.get_my_description import GetMyDescription`
+- alias: :code:`from aiogram.methods import GetMyDescription`
+
+With specific bot
+~~~~~~~~~~~~~~~~~
+
+.. code-block:: python
+
+    result: BotDescription = await bot(GetMyDescription(...))