Update README.md

Author: benitav

README.md

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   <a href="https://www.powersync.com" target="_blank"><img src="https://github.com/powersync-ja/.github/assets/7372448/d2538c43-c1a0-4c47-9a76-41462dba484f"/></a>
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-*[PowerSync](https://www.powersync.com) is a Postgres-SQLite sync layer, which helps developers to create local-first real-time reactive apps that work seamlessly both online and offline.*
+*[PowerSync](https://www.powersync.com) is a Postgres-SQLite sync engine, which helps developers to create local-first real-time reactive apps that work seamlessly both online and offline.*
 
 # PowerSync JavaScript SDKs