New package: python3-mistune2-2.0.0rc1

Use release candidate because it's the latest 2.x release and md2gemini
requires 2.x. python3-jupyte_nbconvert isn't compatible with it yet [1],
unfortunately, so we need a new package.

[1] https://github.com/jupyter/nbconvert/pull/1074

srcpkgs/python3-mistune2/template

@@ -0,0 +1,20 @@
+# Template file for 'python3-mistune2'
+pkgname=python3-mistune2
+version=2.0.0rc1
+revision=1
+wrksrc="mistune-${version}"
+build_style=python3-module
+hostmakedepends="python3-setuptools"
+depends="python3"
+checkdepends="python3-pytest"
+short_desc="Markdown parser for Python"
+maintainer="Érico Nogueira <ericonr@disroot.org>"
+license="BSD-3-Clause"
+homepage="https://github.com/lepture/mistune"
+distfiles="${homepage}/archive/v${version}.tar.gz"
+checksum=ad224a1117fb84f148bc7d804ebe6ad7f14930c3602691e3a85cb894b03606c5
+conflicts="python3-mistune>=0"
+
+post_install() {
+	vlicense LICENSE
+}