Actually load & update config

src/main/java/com/kasetoatz/noexplosiongrief/NoExplosionGrief.java

@@ -0,0 +1,11 @@
+package com.kasetoatz.noexplosiongrief;
+
+import com.kasetoatz.noexplosiongrief.config.Config;
+import net.fabricmc.api.ModInitializer;
+
+public class NoExplosionGrief implements ModInitializer {
+    @Override
+    public void onInitialize() {
+        Config.load();
+    }
+}

src/main/java/com/kasetoatz/noexplosiongrief/config/Config.java

@@ -42,6 +42,7 @@ public class Config {
             {
                 blockWither = json.get("blockWither").getAsBoolean();
             }
+            save();
         }
         catch (IOException exc)
         {

src/main/resources/fabric.mod.json

@@ -14,7 +14,9 @@
   "license": "MIT",
   "environment": "*",
   "entrypoints": {
-    "main": []
+    "main": [
+      "com.kasetoatz.noexplosiongrief.NoExplosionGrief"
+    ]
   },
   "mixins": [
     "noexplosiongrief.mixins.json"