main/asterisk: update url to use https

main/asterisk/APKBUILD

@@ -4,11 +4,11 @@
 # Maintainer: Timo Teras <timo.teras@iki.fi>
 pkgname=asterisk
 pkgver=16.12.0
-pkgrel=0
+pkgrel=1
 pkgdesc="Asterisk: A Module Open Source PBX System"
 pkgusers="asterisk"
 pkggroups="asterisk"
-url="http://www.asterisk.org/"
+url="https://www.asterisk.org/"
 arch="all"
 license="GPL-2.0-only"
 options="!check"  # Test suite is separate, and require separate build