revise error message

Author: Anthony Metzidis

lib/http.js

@@ -250,7 +250,7 @@ module.exports = function (chai, _) {
 
     this.assert(
         redirectCodes.indexOf(status) >= 0 || redirects && redirects.length
-      , "expected redirect status code but got " + status
+      , "expected redirect with 30X status code but got " + status
       , "expected not to redirect but got " + status + " status"
     );
   });

test/http.js

@@ -195,7 +195,7 @@ describe('assertions', function () {
     (function () {
       var res = { status: 200 };
       res.should.redirect;
-    }).should.throw('expected redirect status code but got 200');
+    }).should.throw('expected redirect with 30X status code but got 200');
 
     (function () {
       var res = { status: 301 };