community/py3-feedparser: add py3-sgmllib3k

when I tried launching gnome-feeds after installing I was greeted with import error from feedparser installing sgmllib3k seemed to satisfy it, been a while since I contributed here hopefully I did it right

community/py3-feedparser/APKBUILD

@@ -3,13 +3,13 @@
 pkgname=py3-feedparser
 _pkgname=feedparser
 pkgver=6.0.2
-pkgrel=1
+pkgrel=2
 pkgdesc="Python3 feed parser for RSS and Atom"
 options="!check" # Tests are py2 only
 url="https://github.com/kurtmckee/feedparser"
 arch="noarch"
 license="BSD-2-Clause"
-depends="python3"
+depends="python3 py3-sgmllib3k"
 makedepends="py3-setuptools"
 source="https://files.pythonhosted.org/packages/source/${_pkgname:0:1}/$_pkgname/$_pkgname-$pkgver.tar.gz"
 builddir="$srcdir"/$_pkgname-$pkgver