Upgrade to lodash 4

Author: fmvilas

lib/beautifier.js

@@ -172,7 +172,7 @@ module.exports = (openapi) => {
     });
   });
 
-  openapi.endpoints = _.unique(_.pluck(openapi.paths, 'endpointName'));
+  openapi.endpoints = _.uniq(_.map(openapi.paths, 'endpointName'));
 
   const commonPrefix = sharedStart(Object.keys(openapi.paths));
   const levels = commonPrefix.split('/').length - 1;