Update for perl completion fix (bug #614775)

Debian commit:

commit 5506a39b
Author: Gabriel F. T. Gomes <gabriel@inconstante.eti.br>
Date:   Sat Nov 24 15:25:42 2018 -0200

    Fix perl completion with space between option and argument (bug #614775)

incorporated a fix for perl completions, however the fix was not fully
correct.  This commit updates the patch.

Also fix an error with debian/changelog syntax for the relevant entry.