mxml: update to 3.1

Signed-off-by: Espen Jürgensen <espenjurgensen+openwrt@gmail.com>

libs/mxml/Makefile

@@ -1,14 +1,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mxml
-PKG_VERSION:=2.12
+PKG_VERSION:=3.1
 PKG_RELEASE:=1
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
-PKG_SOURCE_PROTO:=git
-PKG_SOURCE_URL:=https://github.com/michaelrsweet/mxml.git
-PKG_SOURCE_VERSION:=3aaa12c7d709d05286255d191998f29105dd407a
-PKG_MIRROR_HASH:=fccb77d4c9f6139db9937483596068f40112424ef261025227cda258a5561002
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://github.com/michaelrsweet/$(PKG_NAME)/releases/download/v$(PKG_VERSION)/
+PKG_HASH:=1ac8d252f62f9dc2b2004518c70d2da313bdfcd92b8350e215f46064a34b52fc
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 
 PKG_FIXUP:=autoreconf