[RELEASE] Released version 2.4-dev0

Released version 2.4-dev0 with the following main changes :
    - MINOR: version: it's development again.
    - DOC: mention in INSTALL that it's development again
diff --git a/CHANGELOG b/CHANGELOG
index c9a85b4..dac45d1 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,6 +1,10 @@
 ChangeLog :
 ===========
 
+2020/11/05 : 2.4-dev0
+    - MINOR: version: it's development again.
+    - DOC: mention in INSTALL that it's development again
+
 2020/11/05 : 2.3.0
     - CLEANUP: pattern: remove unused entry "tree" in pattern.val
     - BUILD: ssl: use SSL_CTRL_GET_RAW_CIPHERLIST instead of OpenSSL versions