Support version is NMS version now.

Author: IPECTER

src/main/java/com/volmit/adapt/nms/NMS.java

@@ -30,7 +30,8 @@
 public final class NMS {
 
     private static final Map<String, Impl> VERSIONS = new ImmutableMap.Builder<String, Impl>()
-            .put("1.20.4", new NMS_1_20_3())
+            .put("1.20.3", new NMS_1_20_R3())
+            .put("1.20.4", new NMS_1_20_R3())
             .build();
 
     private static String version;

src/main/java/com/volmit/adapt/nms/NMS_1_20_3.java renamed to src/main/java/com/volmit/adapt/nms/NMS_1_20_R3.java

@@ -33,7 +33,7 @@
 import java.io.*;
 import java.util.Base64;
 
-public class NMS_1_20_3 implements NMS.Impl {
+public class NMS_1_20_R3 implements NMS.Impl {
 
     @Override
     public String serializeStack(ItemStack is) {