Update 3.0.0.md

Author: andreasrosdal

changelogs/3.0.0.md

@@ -6,3 +6,6 @@ This means that source code using OpenPDF must be migrated to use import stateme
 * Full PDF 2.0 support in OpenPDF. This is a breaking API change where all version related methods now use
 String instead of char as method parameters. Default version is now PDF 2.0.
 
+* Add batch utility classes which uses Java 21 virtual threads: Html2PdfBatchUtils and PdfBatchUtils.
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