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) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| 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  |
 | 24.3.2019     |  v1.15.2 |  v1.15.2 |  v1.6.1  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 8.3.2019      |  v1.15.1 |  v1.15.1 |  v1.6.1  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
-| 17.2.2019     |  v1.15.0 |  v1.15.0 |  v1.6.1  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 
 Older versions are at the bottom of this page.
 
+## 23.5.2019
+* Implementing first version of system messages (and corresponding admin page).
+* Switch to 24h format for all Datetime form fields (all locales).
+* Assignment results page redesigned.
+* New admin's dialog for creating users (manually).
+* Improving performance of assignment best solution identification and related DB schema issues.
+* Fixing bugs, improving ux.
+
 ## 15.4.2019
 * Haskell support added.
 * Several bugs fixed, including bug in judge of float numbers.
@@ -273,6 +281,7 @@ 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) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|:---:|
+| 17.2.2019     |  v1.15.0 |  v1.15.0 |  v1.6.1  |  v1.3.0  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 28.1.2019     |  v1.14.0 |  v1.14.0 |  v1.6.1  |  v1.2.2  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 2.1.2019      |  v1.13.0 |  v1.13.3 |  v1.6.0  |  v1.2.2  |  v1.2.1  |  v1.0.0  |  v1.1.0  |
 | 12.12.2018    |  v1.12.5 |  v1.13.1 |  v1.6.0  |  v1.2.2  |  v1.2.1  |  v1.0.0  |  v1.1.0  |