debian/control: increase debhelper compatibility version to 13
authorAntonio Ospite <ao2@ao2.it>
Wed, 10 Jun 2020 22:01:48 +0000 (00:01 +0200)
committerAntonio Ospite <ao2@ao2.it>
Fri, 12 Jun 2020 21:51:22 +0000 (23:51 +0200)
Increase debhelper compatibility version to 13 as pointed out by
lintian:

P: tweeper source: package-uses-old-debhelper-compat-version 12


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