Updated Changelog (markdown)

Changelog.md

@@ -2,6 +2,7 @@ This change log tracks the releases on our [pilot server](https://recodex.mff.cu
 
 | Date | [web-app](https://github.com/ReCodEx/web-app/releases) | [core-api](https://github.com/ReCodEx/api/releases) | [worker](https://github.com/ReCodEx/worker/releases) | [broker](https://github.com/ReCodEx/broker/releases) | [monitor](https://github.com/ReCodEx/monitor/releases) | [cleaner](https://github.com/ReCodEx/cleaner/releases) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|
+| 21.11.2021    |  v2.1.1  |  v2.1.1  |  v1.7.3  |  v1.3.0  |  v1.0.0  |  v1.1.0  |
 | 14.11.2021    |  v2.1.0  |  v2.1.0  |  v1.7.3  |  v1.3.0  |  v1.0.0  |  v1.1.0  |
 | 10.10.2021    |  v2.0.2  |  v2.0.2  |  v1.7.3  |  v1.3.0  |  v1.0.0  |  v1.1.0  |
 | 3.10.2021     |  v2.0.1  |  v2.0.1  |  v1.7.3  |  v1.3.0  |  v1.0.0  |  v1.1.0  |
@@ -10,6 +11,10 @@ This change log tracks the releases on our [pilot server](https://recodex.mff.cu
 | 3.3.2021      |  v1.25.1 |  v1.25.1 |  v1.7.2  |  v1.3.0  |  v1.0.0  |  v1.1.0  |
 | 3.2.2021      |  v1.25.0 |  v1.25.0 |  v1.7.2  |  v1.3.0  |  v1.0.0  |  v1.1.0  |
 
+## 21.11.2021
+- Fixing bugs in UI.
+- Optimizing performance of endpoint for fetching exercises.
+
 ## 14.11.2021
 - Adding deadline to shadow assignments.
 - Group tree views refactored and improved.