Bump version to 2.3.1

Change-Id: Ia081aea7a7a842402c3f3edbbd9e510ca288eb46
diff --git a/Changes b/Changes
index b996114..a5624f6 100644
--- a/Changes
+++ b/Changes
@@ -1,9 +1,10 @@
+2.3.1 2022-01-14 Release
         - Improve script handling of broken data
         - Improve handling of unknown header types
         - Check for valid sigles to avoid broken directories
         - Introduce exclusivity for inline tokens handling.
         - Use single dash for STDIN.
-        - Update KorAP-Tokenizer to v2.2.2 (single quote bug fix)
+        - Update KorAP-Tokenizer to v2.2.2 (single quote, "du." bug fixes)
 
 2.2.0 2021-08-26 Release
         - Remove unnecessary branch in recursive call