Print the new bug-report URL.

lib/src/command_runner.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 import 'dart:async';
 import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:args/command_runner.dart';
 import 'package:http/http.dart' as http;
@@ skipping 126 matching lines @@
       if (options['trace']) {
         log.dumpTranscript();
       } else if (!isUserFacingException(error)) {
         // TODO(23505): Implement proper shell escaping, not a partial hack.
         protectArgument(String x) => x.contains(' ') ? '"$x"' : x;
         log.error("""
 This is an unexpected error. Please run
 
     pub --trace ${options.arguments.map(protectArgument).join(' ')}
 
-and include the results in a bug report on http://dartbug.com/new.
+and include the logs in an issue on https://github.com/dart-lang/pub/issues/new
 """);
       }
 
       await flushThenExit(_chooseExitCode(error));
     }
   }
 
   void printUsage() {
     log.message(usage);
   }
@@ skipping 55 matching lines @@
   Future _validatePlatform() async {
     if (Platform.operatingSystem != 'windows') return;
 
     var result = await runProcess('ver', []);
     if (result.stdout.join('\n').contains('XP')) {
       log.error('Sorry, but pub is not supported on Windows XP.');
       await flushThenExit(exit_codes.USAGE);
     }
   }
 }