Update README.md

Author: feeblefakie

README.md

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 ## What is ScalarDB?
-ScalarDB is a cross-database HTAP engine. It achieves ACID transactions and real-time analytics across diverse databases to simplify the complexity of managing multiple databases.
+ScalarDB is a universal HTAP engine. It achieves ACID transactions and real-time analytics across diverse databases to simplify the complexity of managing multiple databases.
 
 <p align="center">
   <a href='https://www.youtube.com/watch?v=lW6nCEJV-gs' target="_blank"><img src='docs/images/scalardb-video-preview.png' width='70%'></a>