fix(readme): update changelog for v1.2.1 release

- Update README.md and README_zh-CN.md with the latest changes
- Add details about bug fixes in version1.2.1
- Include improvements for full-width to half-width conversion, caption matching, and formula span issues

README.md

@@ -47,6 +47,10 @@ Easier to use: Just grab MinerU Desktop. No coding, no login, just a simple inte
 </div>
 
 # Changelog
+- 2025/03/03 1.2.1 released, fixed several bugs:
+  - Fixed the impact on punctuation marks during full-width to half-width conversion of letters and numbers
+  - Fixed caption matching inaccuracies in certain scenarios
+  - Fixed formula span loss issues in certain scenarios
 - 2025/02/24 1.2.0 released. This version includes several fixes and improvements to enhance parsing efficiency and accuracy:
   - Performance Optimization
     - Increased classification speed for PDF documents in auto mode.

README_zh-CN.md

@@ -46,6 +46,10 @@
 </div>
 
 # 更新记录
+- 2025/03/03 1.2.1 发布，修复了一些问题：
+  - 修复在字母与数字的全角转半角操作时对标点符号的影响
+  - 修复在某些情况下caption的匹配不准确问题
+  - 修复在某些情况下的公式span丢失问题
 - 2025/02/24 1.2.0 发布，这个版本我们修复了一些问题，提升了解析的效率与精度：
   - 性能优化 
     - auto模式下pdf文档的分类速度提升