yggdrasil: match contributing.md order of config section

Signed-off-by: William Fleurant <meshnet@protonmail.com>

net/yggdrasil/Makefile

@@ -4,8 +4,8 @@ PKG_NAME:=yggdrasil
 PKG_VERSION:=0.3.6
 PKG_RELEASE:=1
 
-PKG_SOURCE_URL:=https://codeload.github.com/yggdrasil-network/yggdrasil-go/tar.gz/v$(PKG_VERSION)?
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=https://codeload.github.com/yggdrasil-network/yggdrasil-go/tar.gz/v$(PKG_VERSION)?
 PKG_HASH:=dc1699064319f19a64ac57bac366a15d718008fdb75ef03bf4252d3552dff4eb
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-go-$(PKG_VERSION)