Add 1.21.1

Author: Loyisa

src/main/java/us/myles/ViaVersion/api/protocol/ProtocolVersion.java

@@ -90,7 +90,7 @@ public class ProtocolVersion {
     public static final ProtocolVersion v1_20_2 = register(764, "1.20.2");
     public static final ProtocolVersion v1_20_3 = register(765, "1.20.3/1.20.4", new SubVersionRange("1.20", 3, 4));
     public static final ProtocolVersion v1_20_5 = register(766, "1.20.5/1.20.6", new SubVersionRange("1.20", 5, 6));
-    public static final ProtocolVersion v1_21 = register(767, "1.21");
+    public static final ProtocolVersion v1_21 = register(767, "1.21/1.21.1", new SubVersionRange("1.21", 0, 1));
     public static final ProtocolVersion unknown = register(-1, "UNKNOWN");
 
     public static ProtocolVersion register(int version, String name) {