Require perl-5.18.0 to properly lc() and uc() unicode strings

bin/aleesa-telegram-bot

@@ -1,5 +1,6 @@
 #!/usr/bin/perl
 
+use 5.018;
 use strict;
 use warnings "all";
 use utf8;

confcheck.pl

@@ -1,5 +1,6 @@
 #!/usr/bin/perl
 
+use 5.018;
 use strict;
 use warnings "all";
 use utf8;

lib/botlib.pm

@@ -1,5 +1,6 @@
 package botlib;
 
+use 5.018;
 use strict;
 use warnings "all";
 use utf8;

lib/conf.pm

@@ -1,5 +1,6 @@
 package conf;
 
+use 5.018;
 use strict;
 use warnings "all";
 use utf8;

lib/telegrambot.pm

@@ -1,9 +1,9 @@
 package telegrambot;
 
+use 5.018;
 use strict;
 use warnings "all";
 use vars qw/$VERSION/;
-use v5.10.0;
 use utf8;
 use Data::Dumper;
 use open qw(:std :utf8);