[RELEASE] Released version 2.5-dev0

Released version 2.5-dev0 with the following main changes :
    - MINOR: version: it's development again
diff --git a/VERSION b/VERSION
index 197c4d5..f7fe154 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.4.0
+2.5-dev0