dev-python/versioneer: Bump to 0.21

Signed-off-by: Michał Górny <mgorny@gentoo.org>

dev-python/versioneer/Manifest

@@ -1 +1,2 @@
 DIST versioneer-0.20.tar.gz 50634 BLAKE2B 4a64f311b5b7028f15a20c8111f462399bf49340b6ac42272af20427fe5ce722c9d589c04dcb66fe66782ad3ce3491f5fd4807ca06b3caa2342fe3750bedc1be SHA512 7751af838639f06f1f87224b3f87e5d466cf11f32e4da35646a1ea84ba8d21901d47137fab6bde2632f5aaecc2f90f9bbf5968d3fcd3b074e5145762bdde1ae7
+DIST versioneer-0.21.tar.gz 50072 BLAKE2B 83b56dc61b7ba6dd1fb274f08b08e501ab0e209d915785c3a62d733524270a8bd1f60fb09dd3d97c2030fa4e8e154e8351de51beb17774189ae68c12fca1e12a SHA512 a75e68cf1d11ddca220e8e617cd4c2e17b20d8d683c9e6ab94e8470695eee8fa00f7b5a9cb5cfeabd984446dffab70cb7acc749296c235a6a6f1c815f1729583

dev-python/versioneer/versioneer-0.21.ebuild

@@ -0,0 +1,35 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+PYTHON_COMPAT=( python3_{8..10} )
+inherit distutils-r1
+
+DESCRIPTION="Easy VCS-based management of project version strings"
+HOMEPAGE="
+	https://pypi.org/project/versioneer/
+	https://github.com/python-versioneer/python-versioneer/"
+SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${P}.tar.gz"
+
+SLOT="0"
+LICENSE="public-domain"
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux"
+IUSE="test"
+RESTRICT="!test? ( test )"
+
+BDEPEND="
+	test? (
+		dev-python/packaging[${PYTHON_USEDEP}]
+		dev-vcs/git
+	)
+"
+
+python_test() {
+	esetup.py make_versioneer
+
+	git config --global user.email "you@example.com" || die
+	git config --global user.name "Your Name" || die
+
+	"${EPYTHON}" test/git/test_git.py -v || die
+}