Feature Request to update from the clipboard

[shinokada]

As far as I know, I am not able to update a gist from the clipboard. Is it possible to add a function to update from the clipboard?

# create a gist from the clipboard with file name and description.
gist -P -f myfile.py -d "my description"
# REQUEST
# update a gist from the clipboard
gist -uP your-gist-id myfile.py