Update python dependencies, remove old versions

Signed-off-by: Steven Davies <gentoo-guru@steev.me.uk>

sys-fs/python-btrfs/python-btrfs-13-r1.ebuild

@@ -0,0 +1,28 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+PYTHON_COMPAT=( python3_{8,9,10} )
+DISTUTILS_USE_SETUPTOOLS="no"
+
+inherit distutils-r1
+
+DESCRIPTION="Python 3 module to inspect btrfs filesystems"
+HOMEPAGE="https://github.com/knorrie/python-btrfs"
+SRC_URI="https://github.com/knorrie/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+
+LICENSE="GPL-2"
+SLOT="0"
+KEYWORDS="~amd64"
+IUSE="examples"
+
+REQUIRED_USE="${PYTHON_REQUIRED_USE}"
+
+RDEPEND="${PYTHON_DEPS}"
+DEPEND="${RDEPEND}"
+
+python_install_all() {
+	use examples && local DOCS=( README.md CHANGES examples )
+	distutils-r1_python_install_all
+}