Update README.md

Author: hanshuai

README.md

@@ -29,7 +29,7 @@ Openblocks wants to take a step forward. More specifically, Openblocks is
 ## 🪄 Features
 - **Visual UI builder** with 50+ built-in components.
 - **Module and Query Library** for reusable components and queries in the UI builder.
-- **Custom components** to share through React and Openblocks SDK (instead of iFrame). (Pre-alpha)
+- **Custom components** to share through React and Openblocks SDK (instead of iFrame).
 - **Native connections** to PostgreSQL, MongoDB, MySQL, Redis, Elasticsearch, REST API, SMTP, etc.
 - **JavaScript supported everywhere** to transform data, control components, etc.
 - **Embed Openblocks pages as a React component** (instead of iFrame). [Demo](https://github.com/openblocks-dev/openblocks-sdk-demo)