added KyoyuRegion JsonAdapter for fix compatible issue before 1.14

src/main/java/com/vulpeus/kyoyu/placement/KyoyuRegion.java

@@ -1,9 +1,11 @@
 package com.vulpeus.kyoyu.placement;
 
+import com.google.gson.annotations.JsonAdapter;
 import net.minecraft.core.BlockPos;
 import net.minecraft.world.level.block.Mirror;
 import net.minecraft.world.level.block.Rotation;
 
+@JsonAdapter(KyoyuRegionJsonAdapter.class)
 public class KyoyuRegion {
 
     private final BlockPos pos;

src/main/java/com/vulpeus/kyoyu/placement/KyoyuRegionJsonAdapter.java

@@ -0,0 +1,64 @@
+package com.vulpeus.kyoyu.placement;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+import net.minecraft.core.BlockPos;
+import net.minecraft.world.level.block.Mirror;
+import net.minecraft.world.level.block.Rotation;
+
+import java.io.IOException;
+
+public class KyoyuRegionJsonAdapter extends TypeAdapter<KyoyuRegion> {
+    @Override
+    public void write(JsonWriter out, KyoyuRegion value) throws IOException {
+        out.beginObject();
+        out.name("name").value(value.getName());
+        out.name("pos").value(value.getPos().asLong());
+        out.name("mirror").value(value.getMirror().name());
+        out.name("rotation").value(value.getRotation().name());
+        out.name("ignoreEntity").value(value.ignoreEntities());
+        out.name("enable").value(value.isEnable());
+        out.endObject();
+    }
+
+    @Override
+    public KyoyuRegion read(JsonReader in) throws IOException {
+        String name = "none";
+        BlockPos pos = BlockPos.ZERO;
+        Mirror mirror = Mirror.NONE;
+        Rotation rotation = Rotation.NONE;
+        boolean ignoreEntity = false;
+        boolean enable = true;
+
+        in.beginObject();
+        while (in.hasNext()) {
+            String key = in.nextName();
+            switch (key) {
+                case "name":
+                    name = in.nextString();
+                    break;
+                case "pos":
+                    pos = BlockPos.of(in.nextLong());
+                    break;
+                case "mirror":
+                    mirror = Mirror.valueOf(in.nextString());
+                    break;
+                case "rotation":
+                    rotation = Rotation.valueOf(in.nextString());
+                    break;
+                case "ignoreEntity":
+                    ignoreEntity = in.nextBoolean();
+                    break;
+                case "enable":
+                    enable = in.nextBoolean();
+                    break;
+                default:
+                    in.skipValue();
+            }
+        }
+        in.endObject();
+
+        return new KyoyuRegion(pos, mirror, rotation, name, ignoreEntity, enable);
+    }
+}