support gnu+thing

bot.py

@@ -1,6 +1,7 @@
 import argparse
 import asyncio
 import datetime
+import itertools
 import json
 import random
 import re
@@ -320,7 +321,11 @@ def msg_ping(match: Match[str]) -> Response:
 @handle_message(r'.*\b(nano|linux|windows|emacs)\b', flags=re.IGNORECASE)
 def msg_gnu_please(match: Match[str]) -> Response:
     msg, word = match[3], match[4]
-    if f'GNU/{word}' in msg or f'gnu/{word}' in msg:
+    cases = {
+        f'{gnu}{sep}{word}'
+        for gnu, sep in itertools.product(('gnu', 'GNU'), '/+')
+    }
+    if msg in cases:
         return MessageResponse(match, f'YES! GNU/{esc(word)}')
     else:
         return MessageResponse(match, f"Um please, it's GNU/{esc(word)}!")