Update package.json

We are not getting following update using 'npm install consolidate'.

```javascript
exports.swig.render = function(str, options, fn){
  var engine = requires.swig || (requires.swig = require('swig'));
  try {
    // when swig node module + express framework with cache = true option.
    if(options.cache === true) options.cache = 'memory';
    var tmpl = cache(options) || cache(options, engine.compile(str, options));
    fn(null, tmpl(options));
  } catch (err) {
    fn(err);
  }
};
```