Update README.md (#2768)

* Update README.md * Update README.md * Update README.md * Update README.md * Update README.md * Update README.md Co-authored-by: Yee <[email protected]>
vesoft-inc · Sep 3, 2021 · 6136d60 · 6136d60
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@@ -31,7 +31,9 @@ Compared with other graph database solutions, **Nebula Graph** has the following
 
 ## Notice of Release
 
-The Nebula Graph team is glad to announce the Nebula Graph 2.0.0 GA. This is a brand new start with several important updates, and more of them are on the way. Welcome to join us.
+This repository hosts the source code of Nebula Graph versions before 2.0.0-alpha and after v2.5.0. If you are looking to use the versions between v2.0.0 and v2.5.0, please head to [Nebula Graph repo](https://github.com/vesoft-inc/nebula-graph). 
+
+Nebula Graph 1.x is not actively maintained. Please move to Nebula Graph 2.x. The data format, rpc protocols, clients, etc. are not compatible between Nebula Graph v1.x and v2.x, but we do offer [upgrade guide from 1.x to v2.5.0](https://docs.nebula-graph.io/2.5.0/4.deployment-and-installation/3.upgrade-nebula-graph/upgrade-nebula-graph-to-250/).
 
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 To use the stable release, see [Nebula Graph 1.0](https://github.com/vesoft-inc/nebula).