Update v2 branch name on README.md (#150)

README.md

@@ -9,7 +9,7 @@ The Orbbec 3D camera product software development kit fully supports UVC, enabli
 
 This main branch is based on Orbbec SDK v1 and it is compatible with Orbbec's original OpenNI protocol devices through built-in code, enabling developers to migrate to Orbbec SDK to support both new and old products with one set of code.
 
-With the major update in a new branch 2.x-main in 2024 October, Orbbec SDK becomes open-source with enhanced flexibility and scalability. This update in 2.x-main ensures compatibility with all new Orbbec USB products that adhere to the UVC standard. However, [Orbbec SDK v2](https://github.com/orbbec/OrbbecSDK_v2) no longer supports Orbbec's legacy OpenNI protocol devices, which will continue to receive bug fixes support in the Orbbec SDK v1 branch. We encourage you to check out whether your devices is supported by Orbbec SDK v2 and use the new release if it is supported there.
+With the major update in a new branch v2-main in 2024 October, Orbbec SDK becomes open-source with enhanced flexibility and scalability. This update in v2-main ensures compatibility with all new Orbbec USB products that adhere to the UVC standard. However, [Orbbec SDK v2](https://github.com/orbbec/OrbbecSDK_v2) no longer supports Orbbec's legacy OpenNI protocol devices, which will continue to receive bug fixes support in the Orbbec SDK v1 branch. We encourage you to check out whether your devices is supported by Orbbec SDK v2 and use the new release if it is supported there.
 
 If you are a user in China, it is recommended to use Gitee([gitee Repo](https://gitee.com/orbbecdeveloper/OrbbecSDK)).