Pyro incorrectly raises on group commands in cogs

[Skelmis]

This is valid code if its in a cog, pyro thinks it isnt

class c(...):
  @commands.group()
  async def help(self, ctx: commands.Context):
      passs

  @help.command()
  async def ping(self, ctx: commands.Context, command):
    await ctx.send("works")

[Skelmis]

Looks to be closed in #58