[gbrainy] Bump version to 2.3.9

[Jordi Mas <jmas src gnome org>]

commit 1d87164233681d1988626e928812fa079d9f1064
Author: Jordi Mas <jmas softcatala org>
Date:   Sun Nov 11 10:51:14 2018 +0100

    Bump version to 2.3.9

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 9b0c429..33222c0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 # Define gbrainy version
 m4_define([gbrainy_version_major], [2])
 m4_define([gbrainy_version_minor], [3])
-m4_define([gbrainy_version_revision], [8])
+m4_define([gbrainy_version_revision], [9])
 
 m4_define([concat], $1$2$3$4)