dev-lang/coffee-script: add maintainer-needed comment to metadata.xml.

dev-lang/coffee-script: add maintainer-needed comment to metadata.xml.

Come on guys, it's 2020. Do we really need to enforce an untyped
in-comment string format to convey important metadata when the same
typed xml metadata is already present in the file? Just use

  $ xmllint --xpath '/pkgmetadata/maintainer' metadata.xml

instead of

  $ grep maintainer-needed metadata.xml

This is stupid.

Package-Manager: Portage-2.3.89, Repoman-2.3.20
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>