Revert "moved compare to implementation"

This reverts commit baf68a6.

Author: Faithcaio

src/main/java/org/spongepowered/api/MinecraftVersion.java

@@ -73,4 +73,12 @@ public interface MinecraftVersion extends Comparable<MinecraftVersion> {
      */
     OptionalInt dataVersion();
 
+    @Override
+    default int compareTo(MinecraftVersion o) {
+        final int result = Boolean.compare(this.isLegacy(), o.isLegacy());
+        if (result != 0) {
+            return result;
+        }
+        return this.protocolVersion() - o.protocolVersion();
+    }
 }