prepare for version 5.x

ci/test-10-option-u-x.pl

@@ -17,7 +17,7 @@ $cmd->stderr_is_eq("");
 {
 my $cmd = Test::Command->new(cmd => "fping -v");
 $cmd->exit_is_num(0);
-$cmd->stdout_like(qr{ping: Version 4\.\d+(-rc\d+)?
+$cmd->stdout_like(qr{ping: Version [45]\.\d+(-rc\d+)?
 fping: comments to david\@schweikert\.ch
 });
 $cmd->stderr_is_eq("");

configure.ac

@@ -3,7 +3,7 @@ dnl Process this file with autoconf to produce a configure script.
 dnl Minimum Autoconf version required.
 AC_PREREQ(2.59)
 
-AC_INIT([fping],[4.3])
+AC_INIT([fping],[5.0-rc1])
 AC_GNU_SOURCE
 
 dnl --disable-ipv4