Update README.md

Author: OgreTransporter

README.md

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 # PdfFileWriter
-# Version 1.27.0 2020/09/09
+# Version 1.28.0 2021/03/31
 The PDF File Writer C# class library PdfFileWriter allows you to create PDF files directly from your .net application. The library shields you from the details of the PDF file structure.
 
-Version 1.27.0 enhancements: Fix a out of memory problem related to PDF417 barcode. The problem only occured under unusuual circumstances.
+Version 1.28.0 enhancements: Upgrade of the internal file structure to include object streams and cross reverence streams.
 
-For documentation and further information visit <a href="https://www.codeproject.com/Articles/570682/PDF-File-Writer-Csharp-Class-Library-Version">PDF File Writer C# Class Library (Version 1.27.0)</a>
+For documentation and further information visit <a href="https://www.codeproject.com/Articles/570682/PDF-File-Writer-Csharp-Class-Library-Version">PDF File Writer C# Class Library (Version 1.28.0)</a>