don’t escape square brackets

lib/helpers/buildUrl.js

@@ -8,7 +8,9 @@ function encode(val) {
     replace(/%3A/gi, ':').
     replace(/%24/g, '$').
     replace(/%2C/gi, ',').
-    replace(/%20/g, '+');
+    replace(/%20/g, '+')
+    replace(/%5B/gi, '[').
+    replace(/%5D/gi, ']');
 }
 
 /**
@@ -31,7 +33,7 @@ module.exports = function buildUrl(url, params) {
     }
 
     if (utils.isArray(val)) {
-      key = key+'[]';
+      key = key + '[]';
     }
 
     if (!utils.isArray(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%5B%5D=bar&foo%5B%5D=baz');
+    })).toEqual('/foo?foo[]=bar&foo[]=baz');
   });
 
   it('should support special char params', function () {