Updated Changelog (markdown)

Changelog.md

@@ -4,7 +4,7 @@ This change log tracks the releases on our [pilot server](https://recodex.mff.cu
 
 | Date | [web-app](https://github.com/ReCodEx/web-app/releases) | [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) |
 | --- |:---:|:---:|:---:|:---:|:---:|:---:|
-| 16.1.2018    |  v1.?  |  v1.5.0  |  v1.3.0  |  v1.2.0  |  v1.2.1  |  v1.0.0  |
+| 15.2.2018    |  v1.?  |  v1.5.0  |  v1.3.0  |  v1.2.0  |  v1.2.1  |  v1.0.0  |
 | 16.1.2018    |  v1.4.4  |  v1.4.4  |  v1.2.1  |  v1.2.0  |  v1.2.1  |  v1.0.0  |
 | 3.1.2018    |  v1.4.3  |  v1.4.3  |  v1.2.1  |  v1.2.0  |  v1.2.1  |  v1.0.0  |
 | 19.12.2017  |  v1.4.1  |  v1.4.1  |  v1.2.0  |  v1.2.0  |  v1.2.0  |  v1.0.0  |