Cleanup part 2 and Beta 20 requirements

chatchart/__init__.py

@@ -1,7 +1,5 @@
-from discord.ext import commands
 from .chatchart import Chatchart
 
 
-def setup(bot: commands.Bot):
-    n = Chatchart(bot)
-    bot.add_cog(n)
+def setup(bot):
+    bot.add_cog(Chatchart(bot))

chatchart/chatchart.py

@@ -13,7 +13,7 @@ matplotlib.use("agg")
 import matplotlib.pyplot as plt
 
 plt.switch_backend("agg")
-from discord.ext import commands
+from redbot.core import commands
 
 
 class Chatchart: