chore: update open source status for backend code

README.md

@@ -16,7 +16,7 @@ Use it to organize your todo list, to write your journals, or to record your uni
 ## Why Logseq?
 
 [Logseq](https://logseq.com) is a platform for knowledge sharing and management. It focuses on privacy, longevity, and user control.
-Notice: the backend code will not be open-sourced for security reasons and other potential risks.
+Notice: the backend code will be open-sourced as soon as we’re sure that the backend service meets the security standards.
 
 The server will never store or analyze your private notes. Your data are plain text files and we currently support both Markdown and Emacs Org mode (more to be added soon).