go get does not support git submodules

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "data/minecraft-data"]
-	path = data/minecraft-data
-	url = git@github.com:PrismarineJS/minecraft-data.git

data/download_minecraft_data.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+# Go get / install does not clone git submodules so we have to do it like this
+
+rm -rf minecraft-data/
+git clone --depth 1 git@github.com:PrismarineJS/minecraft-data.git
+rm -rf minecraft-data/.git/