Build.PL: Add JSON as a dependency

Author: shawnlaffan

Build.PL

@@ -55,6 +55,7 @@ my $builder = $class->new(
         'HTML::Entities'        => 0,
         'IO::Capture'           => 0,
         'IPC::Run3'             => 0,
+        'JSON'                  => 0,
         'LWP::UserAgent'        => 0,
         'Pod::Usage'            => 0,
         'Portable::Dist'        => '1.06',