Make VCFMetaDataLines public/@internalapi to allow consumers access for customs serialization.

Author: cmnbroad

src/main/java/htsjdk/variant/vcf/VCFMetaDataLines.java

@@ -36,9 +36,9 @@
  *    This class does NOT validate that the lines contained are valid for the current version (that is
  *    the caller's responsibility).
  */
-//Visible to allow disq Kryo registration for serialization
+//Visible to allow registration for custom serialization
 @InternalAPI
-final class VCFMetaDataLines implements Serializable {
+final public class VCFMetaDataLines implements Serializable {
     public static final long serialVersionUID = 1L;
     protected final static Log logger = Log.getInstance(VCFMetaDataLines.class);