Update README.md

README.md

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-# ZimaOS Free trial Program
+# ZimaOS Free Trial Program
 [![release][release-badge]][release]
 [![download][download-badge]][download]
 [![community][community-badge]][community]
 </div>
 
-Welcome to join the open beta program of ZimaOS. ZimaOS is evolved from CasaOS, and we have built a release version of ZimaOS for better hardware compatibility and update experience. It will perfectly adapt to the Zima series hardware and also be compatible with x86-64 systems with UEFI.
+Welcome to join the open free trial program of ZimaOS. ZimaOS is evolved from CasaOS, and we have built a release version of ZimaOS for better hardware compatibility and update experience. It will perfectly adapt to the Zima series hardware and also be compatible with x86-64 systems with UEFI.
 
 It is built using Buildroot and has stable OTA update functionality. Based on CasaOS, we have built a series of new applications. You can find the specific differences between it and CasaOS from the table below: