Discord.py: Message.edit raises TypeError about too many positional arguments on rewrite

[Ovyerus]

May be an issue with ext as I haven't tested with regular.

Can be reproduced by the following snippet

msg = await ctx.send('Test')
return await msg.edit('aaa')

Above snippet results in the following error

TypeError: edit() takes 1 positional argument but 2 were given

[Rapptz]

It's a keyword only argument. msg.edit(content='aaa')