Updated Changelog (markdown)

Changelog.md

@@ -4,13 +4,18 @@ 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) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| 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  |
-| 5.10.2019     |  v1.18.2 |  v1.18.1 |  v1.6.3  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 
 Older versions are at the bottom of this page.
 
+## 30.3.2020
+* Adding comment threads for assignments (as public discussion).
+* Solution file limits (count and size) imposed (configurable in assignments, defaults in exercises).
+* New languages (runtime environments) introduced: Scala, Groovy, Kotlin, and Bash.
+
 ## 13.1.2020
 * Updating main results table on GroupDetail page to display interactive dialog when clicking on particular points.
 * New "reviewed" flag added to assignment solutions.
@@ -317,6 +322,7 @@ 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) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| 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  |
 | 15.4.2019     |  v1.16.1 |  v1.16.0 |  v1.6.2  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |