changing Main.class to getClass() in readme

Author: erosb

README.md

@@ -13,7 +13,7 @@ import org.everit.jsonvalidator.loader.SchemaLoader;
 import org.json.JSONObject;
 import org.json.JSONTokener;
 // ...
-JSONObject rawSchema = new JSONObject(new JSONTokener(Main.class.getResourceAsStream("/path/to/your/schema.json")));
+JSONObject rawSchema = new JSONObject(new JSONTokener(getClass().getResourceAsStream("/path/to/your/schema.json")));
 Schema schema = SchemaLoader.load(rawSchema);
 schema.validate(new JSONObject("{\"hello\" : \"world\"}")); // throws a ValidationException if this object is invalid
 ```