Sign-off workflow doesn't like hyphens in names

[DMRobertson]

(Pretty sure my diagnosis is right, eyeballing the regex that the script uses)

See e.g. matrix-org/complement#622 (comment) for example

[hughns]

It looks like it wouldn't allow a ' or diacritics more generally.

Perhaps replacing the [\w ]+ with [^<>]+ would suffice.

[Half-Shot]

Fixed in #20