fix array params

lib/helpers/buildUrl.js

@@ -29,6 +29,11 @@ module.exports = function buildUrl(url, params) {
     if (val === null || typeof val === 'undefined') {
       return;
     }
+
+    if (utils.isArray(val)) {
+      key = key+'[]';
+    }
+
     if (!utils.isArray(val)) {
       val = [val];
     }

test/specs/helpers/buildUrl.spec.js

@@ -30,7 +30,7 @@ describe('helpers::buildUrl', function () {
   it('should support array params', function () {
     expect(buildUrl('/foo', {
       foo: ['bar', 'baz']
-    })).toEqual('/foo?foo=bar&foo=baz');
+    })).toEqual('/foo?foo%5B%5D=bar&foo%5B%5D=baz');
   });
 
   it('should support special char params', function () {