docs: add version explanation

README.md

@@ -1,5 +1,5 @@
 <div align="center">
-  <a href="https://alist.nn.ci"><img height="100px" alt="logo" src="https://jsd.nn.ci/gh/alist-org/logo@main/logo.svg"/></a>
+  <a href="https://alist.nn.ci"><img height="100px" alt="logo" src="https://cdn.jsdelivr.net/gh/alist-org/logo@main/logo.svg"/></a>
   <p><em>🗂️A file list program that supports multiple storage, powered by Gin and React.</em></p>
   <a href="https://github.com/Xhofe/alist/releases"><img src="https://img.shields.io/github/release/Xhofe/alist?style=flat-square" alt="latest version"></a>
   <a href="https://github.com/Xhofe/alist/discussions"><img src="https://img.shields.io/github/discussions/Xhofe/alist?color=%23ED8936&style=flat-square" alt="discussions"></a>
@@ -15,6 +15,8 @@
 
 [Contributors](./CONTRIBUTORS.md) | [Contributing](./CONTRIBUTING.md)
 
+> ### New version is under development. Checkout [v2](https://github.com/alist-org/alist/tree/v2) branch for latest version.
+
 ## Discussion
 
 Please go to our [discussion forum](https://github.com/Xhofe/alist/discussions) for general questions, **issues are for bug reports and feature request only.**