Update changelog.

CHANGELOG.rst

 Changelog
 =========
 
+`1.0a2`_
+--------
+
+New features
+~~~~~~~~~~~~
+
+* Devs: LessonPeriod now has a custom QuerySet and manager for advanced filtering
+
+Bugfixes
+~~~~~~~~
+
+* Room plan includes substituted lessons now
+
+
 `1.0a1`_
 --------
 
@@ -22,3 +36,4 @@ Minor changes
 * Use bootstrap buttons everywhere
 
 _`1.0a1`: https://edugit.org/Teckids/BiscuIT/BiscuIT-App-Chronos/-/tags/1.0a1
+_`1.0a2`: https://edugit.org/Teckids/BiscuIT/BiscuIT-App-Chronos/-/tags/1.0a2