added aspect_filters as a parameter at searchItem :) (#64)

* Update buy-api.js

* Update buy-api.js

* Update buy-api.js

Author: nickpap2

src/buy-api.js

@@ -60,6 +60,7 @@ const searchItems = function (searchConfig) {
     queryParam = queryParam + (searchConfig.sort ? '&sort=' + searchConfig.sort : '');
     if (searchConfig.fieldgroups !== undefined) queryParam = queryParam + '&fieldgroups=' + searchConfig.fieldgroups;
     if (searchConfig.filter !== undefined) queryParam = queryParam + '&filter=' + encodeURLQuery(makeString(searchConfig.filter, { quotes: 'no', braces: 'false' }));
+    queryParam = queryParam + (searchConfig.aspect_filter ? '&aspect_filter='+ encodeURLQuery(makeString(searchConfig.aspect_filter, { quotes: 'no', braces: 'false' })) : '');
     this.options.contentType = 'application/json';
     return new Promise((resolve, reject) => {
         makeRequest(this.options, `/buy/browse/v1/item_summary/search?${(queryParam)}`, 'GET', auth).then((result) => {