[RELEASE] Released version 2.6-dev0

Released version 2.6-dev0 with the following main changes :
    - MINOR: version: it's development again
diff --git a/CHANGELOG b/CHANGELOG
index c7955e1..3cdc2cd 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,9 @@
 ChangeLog :
 ===========
 
+2021/11/23 : 2.6-dev0
+    - MINOR: version: it's development again
+
 2021/11/23 : 2.5.0
     - BUILD: SSL: add quictls build to scripts/build-ssl.sh
     - BUILD: SSL: add QUICTLS to build matrix