Show workaround for the caching/production bug in paypal/makara

[alchemycs]

Might be worth while updating the README and example to show the workaround for the caching/production bug in paypal/makara issue 9

i.e., if you run with NODE_ENV=production the localisation will not work as expected, you must use something like:

//In production, this is wrong:
res.locals.context = {
  locality: 'en_AU';
}; //Broken with NODE_ENV=production

res.locals.context = {
  locality: {
    country: 'AU',
    language: 'en'
  }
}; //Works with NODE_ENV=production