use preferred variable for making version checks

examples/application_client_test.t

@@ -11,7 +11,7 @@ use warnings;
 # different ways so we can test how we interact with it.
 
 use Test::More;
-BEGIN { plan skip_all => 'this example requires perl 5.10' if $^V < 5.010; }
+BEGIN { plan skip_all => 'this example requires perl 5.10' if "$]" < '5.010'; }
 use Test::Needs qw(JSON::MaybeXS Moose);
 use Test::Warnings 0.009 ':all';
 use Test::LWP::UserAgent;