[orca] Post-release version bump

[Joanmarie Diggs <joanied src gnome org>]

commit cdde15231eb161edbadae5bae6ce03bca8d24222
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Mon Jan 14 13:49:29 2019 -0500

    Post-release version bump

 README       | 2 +-
 configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README b/README
index ca44917dc..1ac1b9999 100644
--- a/README
+++ b/README
@@ -1,4 +1,4 @@
-Orca v3.31.4
+Orca v3.31.90pre
 
 Introduction
 ========================================================================
diff --git a/configure.ac b/configure.ac
index 2f372e3ff..a38e516ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 m4_define([orca_major_version], [3])
 m4_define([orca_minor_version], [31])
-m4_define([orca_micro_version], [4])
+m4_define([orca_micro_version], [90pre])
 m4_define([orca_version],
           [orca_major_version.orca_minor_version.orca_micro_version])