Fix missing JSON requirement

Author: tessarin

Build.PL

@@ -9,6 +9,7 @@ my $build = Module::Build->new(
         'Data::Dumper' => '2.1',
         'File::Share' => '0.27',
         'Hash::MultiValue', '0.16',
+        'JSON' => '4.10',
         'Path::Tiny' => '0.142',
         'Plack' => '1.0050',
         'Router::Simple' => '0.17',

cpanfile

@@ -2,6 +2,7 @@ requires perl, '5.40.0';
 requires 'Data::Dumper', '2.1';
 requires 'File::Share', '0.27';
 requires 'Hash::MultiValue', '0.16';
+requires 'JSON', '4.10';
 requires 'Path::Tiny', '0.142';
 requires 'Plack', '1.0050';
 requires 'Router::Simple', '0.17';