Add github_url to minecraft-forge

Author: piprett

topics/minecraft-forge/index.md

@@ -2,10 +2,11 @@
 aliases: forge, minecraftforge, minecraft-forge-mod, minecraft-forge-mods, minecraft-forge-modification, forgemc
 display_name: Minecraft Forge
 logo: minecraft-forge.png
-related: minecraft, minecraft-mod
+related: minecraft, minecraft-mod, java
 short_description: Forge is a popular modloader for Minecraft.
 topic: minecraft-forge
 url: https://minecraftforge.net/
+github_url: https://github.com/MinecraftForge/MinecraftForge
 ---
 Published by Mojang, Minecraft is a game that allows its players virtually unlimited creative and building authority in their 3D cube world.