Truncate title to 256 characters

src/message.py

@@ -2,7 +2,15 @@ import discord
 
 
 class BotMessage(discord.Embed):
-  pass
+  def __init__(self, **kwargs):
+    title = kwargs.pop("title", None)[:256]
+    if title is not None:
+      # Max embed title length is 256
+      title = title[:256]
+    super().__init__(
+        **kwargs,
+        title=title
+    )
 
 
 class ErrorMessage(BotMessage):