https-dns-proxy: Switch from bz2 to xz

Signed-off-by: Aaron Drew <aarond10@gmail.com>

net/https-dns-proxy/Makefile

@@ -4,7 +4,7 @@ PKG_NAME:=https_dns_proxy
 PKG_VERSION:=2017-01-07
 PKG_RELEASE=1
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_SUBDIR:=$(PKG_NAME)-$(PKG_VERSION)
 PKG_SOURCE_URL:=https://github.com/aarond10/https_dns_proxy/
 PKG_SOURCE_PROTO:=git