[ELPA] Use :release-branch for plz.el

[Adam Porter]

Hi Stefan, Philip, et al,

Please see the attached patch which sets the release branch for plz.el. 
This will allow me to make small, bug-fix version releases from the 
stable branch while the next version is in development on the master branch.

BTW, after having done this for a few packages now, this seems to me to 
be the best practice.  It might be worth recommending this for new packages.

Thanks,
Adam

0001-elpa-packages-plz-release-branch-stable.patch
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