Use character classes instead of alternations in regexes

Change-Id: Ie79ce4882cbd7a18acddf719959640f0a8afe14c
diff --git a/Changes b/Changes
index a09dc54..8cfb3d1 100644
--- a/Changes
+++ b/Changes
@@ -1,6 +1,8 @@
-0.36 2020-06-16
+0.36 2020-07-15
     - [security] Upgraded version of Google Guava
       (CVE-2018-10237; diewald)
+    - Optimize regular expressions to use character classes
+      instead of alternations (kupietz)
 
 0.35 2019-11-12
     - Added a method to add warnings in QuerySerializer (margaretha)