Move Snapshot Protocol Version(s) into SnapshotProtocolVersion

Author: lowercasebtw

src/main/java/btw/lowercase/viasnapshot/Main.java

@@ -22,7 +22,7 @@ public void onInitializeEvent(ProtocolTranslatorInitEvent event) {
             Via.getManager().getSubPlatforms().add(String.format("git-ViaSnapshot-%s", getVersion()));
 
             final ProtocolManager protocolManager = Via.getManager().getProtocolManager();
-            protocolManager.registerProtocol(new Protocol15w31a_To1_8(), ProtocolVersion.register(49, "15w31a (Client Only)"), ProtocolVersion.v1_8);
+            protocolManager.registerProtocol(new Protocol15w31a_To1_8(), SnapshotProtocolVersion.v15w31a, ProtocolVersion.v1_8);
             return null;
         });
     }

src/main/java/btw/lowercase/viasnapshot/SnapshotProtocolVersion.java

@@ -0,0 +1,7 @@
+package btw.lowercase.viasnapshot;
+
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+
+public class SnapshotProtocolVersion {
+    public static final ProtocolVersion v15w31a = ProtocolVersion.register(49, "15w31a (Client Only)");
+}