Revise release notes for v1.2.0

Updated release notes for version 1.2.0 to include MCP Server details.

Author: maninhill

README.md

@@ -80,7 +80,7 @@ docker run -d \
 - [x] 2025.09.01：[v1.1.7](https://github.com/1Panel-dev/CordysCRM/releases/tag/v1.1.7) 发布
 - [x] 2025.09.05：[v1.1.8](https://github.com/1Panel-dev/CordysCRM/releases/tag/v1.1.8) 发布
 - [x] 2025.09.12：[v1.1.9](https://github.com/1Panel-dev/CordysCRM/releases/tag/v1.1.9) 发布
-- [x] 2025.09.19：[v1.2.0](https://github.com/1Panel-dev/CordysCRM/releases/tag/v1.2.0) 发布，完成和 MaxKB 的对接
+- [x] 2025.09.19：[v1.2.0](https://github.com/1Panel-dev/CordysCRM/releases/tag/v1.2.0) 发布，开放 MCP Server，并完成和 MaxKB 的对接
 - [ ] 2025.11：代码开源、正式发布
 
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