Bump release number to 4.7.91

rpm sorts pre1 release after dev releases. To have dev releases override
pre releases in upstream, the patch level must be bumped after every pre
release.

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Fraser Tweedale <ftweedal@redhat.com>

VERSION.m4

@@ -21,13 +21,16 @@
 ########################################################
 define(IPA_VERSION_MAJOR, 4)
 define(IPA_VERSION_MINOR, 7)
-define(IPA_VERSION_RELEASE, 90)
+define(IPA_VERSION_RELEASE, 91)
 
 ########################################################
 # For 'pre' releases the version will be               #
 #                                                      #
 # <MAJOR>.<MINOR>.<RELEASE><PRE_RELEASE>               #
 #                                                      #
+# pre releases start with RELEASE 90. After pre1 has   #
+# been released, RELEASE is bumpled to 91, and so on   #
+#                                                      #
 # e.g. define(IPA_VERSION_PRE_RELEASE, rc1)            #
 #  ->  "1.0.0rc1"                                      #
 ########################################################