main/automake: upgrade to 1.13

main/automake/APKBUILD

 # Maintainer: Natanael Copa <ncopa@alpinelinux.org>
 pkgname=automake
-pkgver=1.12.6
+pkgver=1.13
 pkgrel=0
 pkgdesc="A GNU tool for automatically creating Makefiles"
 arch="noarch"
@@ -22,4 +22,4 @@ package() {
         make DESTDIR=$pkgdir install
 }
 
-md5sums="199d39ece2e6070d64ac20d45ac86026  automake-1.12.6.tar.gz"
+md5sums="255661c7729d04ef2f8f58d076c89ecc  automake-1.13.tar.gz"