use yarn mappings

src/client/java/skybakery/mixin/client/ExampleClientMixin.java

@@ -1,15 +1,8 @@
 package skybakery.mixin.client;
 
-import net.minecraft.client.Minecraft;
+import net.minecraft.client.MinecraftClient;
 import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
-@Mixin(Minecraft.class)
+@Mixin(MinecraftClient.class)
 public class ExampleClientMixin {
-	@Inject(at = @At("HEAD"), method = "run")
-	private void init(CallbackInfo info) {
-		// This code is injected into the start of Minecraft.run()V
-	}
 }