bump required perl version (#447)

- /u is added in perl 5.14 - [link to perl5140delta](https://perldoc.perl.org/5.14.4/perl5140delta#/d,-/l,-/u,-and-/a-modifiers)

Author: morbeo

diff-so-fancy

@@ -4,7 +4,7 @@ my $VERSION = "1.4.4";
 
 #################################################################################
 
-use v5.010;                                                 # Require Perl 5.10 for 'state' variables
+use v5.014;                                                 # Require Perl 5.14 for 'state' variables and /u in regexes
 use warnings FATAL => 'all';
 use strict;