Fixup changelog chaos and set version to 2.0b2

CHANGELOG.rst

@@ -6,17 +6,24 @@ All notable changes to this project will be documented in this file.
 The format is based on `Keep a Changelog`_,
 and this project adheres to `Semantic Versioning`_.
 
-Unreleased
-----------
+`2.0b2` - 2021-06-02
+--------------------
 
 Fixed
 ~~~~~
 
-* Fix migration names and dependencies
 * Migration path was ambigious
 * Unique constraints for breaks and substitutions were too tight
 * Absences in substitutions list were displayed multiple times.
 
+`2.0b1`_ - 2021-05-22
+---------------------
+
+Fixed
+~~~~~
+
+* Fix migration names and dependencies
+
 `2.0b0`_ - 2021-05-21
 ---------------------
 
@@ -152,3 +159,4 @@ Fixed
 .. _2.0a2: https://edugit.org/AlekSIS/Official/AlekSIS-App-Chronos/-/tags/2.0a2
 .. _2.0b0: https://edugit.org/AlekSIS/Official/AlekSIS-App-Chronos/-/tags/2.0b0
 .. _2.0b1: https://edugit.org/AlekSIS/Official/AlekSIS-App-Chronos/-/tags/2.0b1
+.. _2.0b2: https://edugit.org/AlekSIS/Official/AlekSIS-App-Chronos/-/tags/2.0b2