Special characters handling

* Fix README for python version
* Add discord-friendly unidecode function for channel names (avoiding
  special characted)
* Check if "items" is present before accessing in channel id request
  response

breadtube_bot/youtube_subscription.py

@@ -2,6 +2,9 @@ from __future__ import annotations
 
 from dataclasses import dataclass, field
 from datetime import datetime
+from typing import NewType
+
+from breadtube_bot.unidecode import unidecode
 
 
 @dataclass
@@ -51,19 +54,27 @@ class ChannelInfo:
             url=info['url'])
 
 
+SubscriptionName = NewType('SubscriptionName', str)
+
+
 @dataclass
 class SubscriptionInfo:
-    name: str
+    name: SubscriptionName
     channel_id: str
     last_update: float
     channel_info: ChannelInfo | None = None
     video_list: list[VideoInfo] = field(default_factory=list)
 
+    @staticmethod
+    def discord_compatible_name(text: str) -> SubscriptionName:
+        assert text, 'Channel name cannot be empty'
+        return SubscriptionName(unidecode(text[:100]))
+
     @staticmethod
     def from_dict(info: dict) -> SubscriptionInfo:
         channel_info: dict | None = info.get('channel_info')
         return SubscriptionInfo(
-            name=info['name'],
+            name=SubscriptionInfo.discord_compatible_name(info['name']),
             channel_id=info['channel_id'],
             last_update=info['last_update'],
             channel_info=ChannelInfo.from_dict(channel_info) if channel_info is not None else None,
@@ -91,7 +102,8 @@ class SubscriptionHelper:
                                 f', got {len(values)} but expected {len(SUBSCRIPTION_FILE_COLUMNS)}')
             name = values[0].decode()
             channel_id = values[1].decode()
-            subscriptions[channel_id] = SubscriptionInfo(name=name, channel_id=channel_id, last_update=0)
+            subscriptions[channel_id] = SubscriptionInfo(
+                name=SubscriptionInfo.discord_compatible_name(name), channel_id=channel_id, last_update=0)
         return subscriptions
 
     @staticmethod