Change 'utils' library to 'http.utils'

Author: azenla

lib/src/utils.dart

@@ -2,7 +2,7 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library utils;
+library http.utils;
 
 import 'dart:async';
 import 'dart:convert';