Updated CHANGELOG.md

CHANGELOG.md

@@ -7,6 +7,26 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 Generated by [`auto-changelog`](https://github.com/CookPete/auto-changelog).
 
+## [v1.2.12](https://github.com/tencentyun/cos-js-sdk-v5/compare/v1.2.11...v1.2.12) - 2021-06-03
+
+-demo新增简单上传base64内容文件
+-sliceUploadFile方法新增返回值UploadId
+
+### Merged
+
+- Feat/put object base64&return upload [`#111`](https://github.com/tencentyun/cos-js-sdk-v5/pull/111)
+
+### Commits
+
+- feat [`1e2ca3a`](https://github.com/tencentyun/cos-js-sdk-v5/commit/1e2ca3ae255f64fee4aaab36c01d5a03eb3162a2)
+- upd：sliceUploadFile返回UploadId [`54d100f`](https://github.com/tencentyun/cos-js-sdk-v5/commit/54d100f41c8bd124c978860532d8a2a81ab1ff9d)
+- Updated CHANGELOG.md [`4a04539`](https://github.com/tencentyun/cos-js-sdk-v5/commit/4a0453966d67b586dbfe186e38973f72ffa8f9bd)
+- update version 1.2.12 [`843ffba`](https://github.com/tencentyun/cos-js-sdk-v5/commit/843ffba1ed4bb22ed5b23e5aeb7833f17f5577ad)
+- update version 1.2.12 [`cd0be19`](https://github.com/tencentyun/cos-js-sdk-v5/commit/cd0be1996ee5bf9e1cd007da2f44b121f23c04ab)
+- upd：sliceUploadFile返回UploadId [`4ff8a8e`](https://github.com/tencentyun/cos-js-sdk-v5/commit/4ff8a8ef35e5e6e80ed6aa2fdac629a954e596d6)
+- upd：优化base64文件上传demo [`cb8f356`](https://github.com/tencentyun/cos-js-sdk-v5/commit/cb8f356b2774280d7dce7886f4016a84c724fa14)
+- _No commit message_ [`c20924e`](https://github.com/tencentyun/cos-js-sdk-v5/commit/c20924e01e53e2045c2e30e76449a3d38dba6d57)
+
 ## [v1.2.11](https://github.com/tencentyun/cos-js-sdk-v5/compare/v1.2.10...v1.2.11) - 2021-05-28
 
 ### Merged