add GitHub url to info.json

Author: desto-git

info.json

@@ -4,8 +4,7 @@
     "version": "1.0.0",
     "title": "Sapling Capsule",
     "author": "desto",
-    "contact": "",
-    "homepage": "",
+    "homepage": "https://github.com/desto-git/factorio-sapling-capsule",
     "factorio_version": "0.18",
     "dependencies": ["base >= 0.18", "? alien-biomes"]
 }