Updated Changelog (markdown)

Changelog.md

@@ -13,7 +13,14 @@ Older versions are at the bottom of this page.
 
 ## 17.2.2019
 
-TODO
+* New broker features (reading stats, freeze/unfreeze) implemented (including controls in UI).
+* Updating appearance of registration forms.
+* Multiple webapp instances may now run on the same domain (and DEMO recodex was installed on the MFF domain).
+* Adding a better endpoint for getting and setting exercise limits (**old limits endpoints were deprecated**).
+* Adding tags to exercises (API only).
+* Adding configuration and implicit groups to internal registration.
+* Migration of the entire database (and ORM model) to UTF8mb4 (finally, we can use emoji 😉).
+* Many bug fixes and minor UX improvements.
 
 ## 28.1.2019