Updated Changelog (markdown)

Changelog.md

@@ -4,13 +4,21 @@ This change log tracks the releases on our [pilot server](https://recodex.mff.cu
 
 | Date | [web-app](https://github.com/ReCodEx/web-app/releases) | [api](https://github.com/ReCodEx/api/releases) | [worker](https://github.com/ReCodEx/worker/releases) | [broker](https://github.com/ReCodEx/broker/releases) | [fileserver](https://github.com/ReCodEx/fileserver/releases) | [monitor](https://github.com/ReCodEx/monitor/releases) | [cleaner](https://github.com/ReCodEx/cleaner/releases) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| 13.8.2020     |  v1.22.0 |  v1.22.0 |  v1.6.4  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 30.3.2020     |  v1.21.0 |  v1.21.0 |  v1.6.4  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 13.1.2020     |  v1.20.0 |  v1.20.0 |  v1.6.4  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 30.11.2019    |  v1.19.0 |  v1.19.0 |  v1.6.4  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
-| 26.10.2019    |  v1.18.3 |  v1.18.2 |  v1.6.3  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 
 Older versions are at the bottom of this page.
 
+## 13.8.2020
+* Refactoring score (tests) edit form and implementing AST tree expression editor
+* Implementing "explain" button for (reference) solution score that shows dialog that explains how solution correctness was computed
+* Improving error reporting for exercise configuration (entangling error messages with links to forms where the problem should be fixed)
+* Adding 'detaining' flag of groups, which prevents students from leaving the group on their own
+* Showing evaluation failures to regular users
+* Multiple minor ux improvements
+
 ## 30.3.2020
 * Adding comment threads for assignments (as public discussion).
 * Solution file limits (count and size) imposed (configurable in assignments, defaults in exercises).
@@ -322,6 +330,7 @@ Older versions are at the bottom of this page.
 
 | Date | [web-app](https://github.com/ReCodEx/web-app/releases) | [api](https://github.com/ReCodEx/api/releases) | [worker](https://github.com/ReCodEx/worker/releases) | [broker](https://github.com/ReCodEx/broker/releases) | [fileserver](https://github.com/ReCodEx/fileserver/releases) | [monitor](https://github.com/ReCodEx/monitor/releases) | [cleaner](https://github.com/ReCodEx/cleaner/releases) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| 26.10.2019    |  v1.18.3 |  v1.18.2 |  v1.6.3  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 5.10.2019     |  v1.18.2 |  v1.18.1 |  v1.6.3  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 22.9.2019     |  v1.18.1 |  v1.18.0 |  v1.6.3  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 23.5.2019     |  v1.17.0 |  v1.17.0 |  v1.6.2  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |