main/asciidoctor: upgrade to 2.0.13

main/asciidoctor/APKBUILD

 # Contributor: Seung Soo Mun <hamletmun@gmail.com>
 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=asciidoctor
-pkgver=2.0.12
+pkgver=2.0.13
 pkgrel=0
 pkgdesc="Converter for AsciiDoc to HTML5, DocBook 5 (or 4.5) and other formats"
 url="https://rubygems.org/gems/$pkgname"
@@ -33,4 +33,4 @@ package() {
 	done
 }
 
-sha512sums="a927d052e4a2934524d8222700e83fbc746fa2b4880a810e39a579c1dff02054c83284a1c9e0af176709c0ab129677fcfcaa14c038ec124fb394852f38294db5  asciidoctor-2.0.12.gem"
+sha512sums="6ea164456b1b6a9aead6983594a0f72ba291aad9aeeacbe4ae709c3098dff90cb110021ef8c4edeaa728e7d52ac79880edde1822ed9a5b18066005a024358767  asciidoctor-2.0.13.gem"