Add accepted types to Tester interface.

src/main/lombok/org/leumasjaffe/json/schema/Tester.java

@@ -1,7 +1,9 @@
 package org.leumasjaffe.json.schema;
 
 import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.JsonNodeType;
 
 public interface Tester {
+	default JsonNodeType[] acceptedTypes() { return null; }
 	boolean accepts(final JsonNode node);
 }