Added usage example of errors_handler

Optimized generation of default/inline keyboard
Customizing webhook path has become more flexible
Updated aiogram version to 2.7 (BotAPI 4.7)

keyboards/default/consts.py

@@ -0,0 +1,15 @@
+from typing import List
+
+from aiogram.types import ReplyKeyboardMarkup, KeyboardButton
+
+from . import utils
+
+
+class DefaultConstructor:
+    @staticmethod
+    def _create_kb(actions: List[str], schema: List[int]) -> ReplyKeyboardMarkup:
+        btns = []
+        for a in actions:
+            btns.append(KeyboardButton(a))
+        kb = utils.misc.arrange_default_schema(btns, schema)
+        return kb