Bump version to 2.15

Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>

configure.ac

@@ -34,7 +34,7 @@ dnl "TARGET_" (such as TARGET_CC, TARGET_CFLAGS, etc.) are used for
 dnl the target type. See INSTALL for full list of variables and
 dnl description of the relationships between them.
 
-AC_INIT([GRUB],[2.14],[bug-grub@gnu.org])
+AC_INIT([GRUB],[2.15],[bug-grub@gnu.org])
 
 AS_CASE(["$ERROR_PLATFORM_NOT_SUPPORT_SSP"],
   [n | no | nO | N | No | NO], [ERROR_PLATFORM_NOT_SUPPORT_SSP=no],