fix visibility

Author: hauner

json-schema-validator/src/main/java/io/openapiprocessor/jsonschema/schema/Document.java

@@ -5,8 +5,8 @@
 
 package io.openapiprocessor.jsonschema.schema;
 
-class Document {
- enum Source {
+public class Document {
+ public enum Source {
  ID, ANCHOR, DYNAMIC_ANCHOR
  }