automatically set mod version on export

src/main/resources/fabric.mod.json

@@ -2,7 +2,7 @@
   "id": "modid",
   "name": "Example Mod",
   "description": "This is an example description! Tell everyone what your mod is about!",
-  "version": "1.0.0",
+  "version": "${version}",
   "side": "universal",
   "initializers": [
     "net.fabricmc.example.ExampleMod"