[libgfbgraph] build: Post-release version bump to 0.3.x

[Leesoo Ahn <yisooan src gnome org>]

commit eeba8bffe0e52f319d81adb226abb8333244237c
Author: Leesoo Ahn <yisooan fedoraproject org>
Date:   Sat May 9 18:31:52 2020 +0900

    build: Post-release version bump to 0.3.x
    
    We change the API version for experiments.

 configure.ac | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index fd1231f..58d55eb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 m4_define([api_major], [0])
-m4_define([api_minor], [2])
-m4_define([api_micro], [4])
+m4_define([api_minor], [3])
+m4_define([api_micro], [0])
 
 m4_define([gfbgraph_version], [api_major.api_minor.api_micro])