VersionMinter interface must be public

hollow/src/main/java/com/netflix/hollow/api/producer/HollowProducer.java

@@ -556,7 +556,7 @@ private void announce(HollowProducer.ReadState readState) {
         }
     }
 
-    static interface VersionMinter {
+    public static interface VersionMinter {
         /**
          * Create a new state version.<p>
          *

hollow/src/main/java/com/netflix/hollow/api/producer/VersionMinterWithCounter.java

@@ -17,17 +17,18 @@
  */
 package com.netflix.hollow.api.producer;
 
+import com.netflix.hollow.api.producer.HollowProducer.VersionMinter;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.TimeZone;
 import java.util.concurrent.atomic.AtomicInteger;
 
 /**
- * Beta API subject to change.
+ * A {@link VersionMinter}, which combines a timestamp with a repeating 3-digit sequence number
  *
  * @author Tim Taylor {@literal<[email protected]>}
  */
-class VersionMinterWithCounter implements HollowProducer.VersionMinter {
+public class VersionMinterWithCounter implements HollowProducer.VersionMinter {
 
     private static AtomicInteger versionCounter = new AtomicInteger();