Follow up on FSF copyright assignment for open pull request

[progfolio]

ch11ng/exwm#899

Contributor has signed. Just need to confirm assignment.
Then pull can be merged.

[medranocalvo]

ch11ng/exwm#899 (comment):

I asked again on 31 March with no answer.

I have now asked again @mitch-kyle and the GNU ELPA Maintainer.