Up the release number to 2.31.

Signed-off-by: Andrew G. Morgan <morgan@kernel.org>
diff --git a/Make.Rules b/Make.Rules
index 85947c4..39ccbbd 100644
--- a/Make.Rules
+++ b/Make.Rules
@@ -41,7 +41,7 @@
 # common defines for libcap
 LIBTITLE=libcap
 VERSION=2
-MINOR=30
+MINOR=31
 #
 
 # Compilation specifics