print error for Application class

[Vic-ong]

Hi,

I found that when I tried to print the details of the Application, it fails. This is because the client version variable is wrong:

should be edited to:
def __str__(self): return "%s (v%s)" % (self.client, self.client_version)

original code on commands.py of Application class:
def __str__(self): return "%s (v%s)" % (self.client, self.version)

[23maverick23]

Thanks for submitting. Feel free to submit a PR. Otherwise I can try and get to this over the weekend.