Update classic style

app/src/main/java/eu/konggdev/strikemaps/map/source/MapSource.java

@@ -1,9 +1,18 @@
 package eu.konggdev.strikemaps.map.source;
 
+import com.fasterxml.jackson.databind.JsonNode;
+
 public class MapSource {
     public String url;
     public String type;
     public String schema;
     
+    public String attribution;
+
+    /* For raster sources */
+    public JsonNode tiles;
+    public int minzoom;
+    public int maxzoom;
+
     public MapSource() { }
 }