Update charted to 0.4.8 and roll

packages/which/README.md

-which [![pub package](http://img.shields.io/pub/v/which.svg)](https://pub.dartlang.org/packages/which) [![Build Status](https://drone.io/github.com/seaneagan/which.dart/status.png)](https://drone.io/github.com/seaneagan/which.dart/latest) [![Coverage Status](https://img.shields.io/coveralls/seaneagan/which.dart.svg)](https://coveralls.io/r/seaneagan/which.dart?branch=master)
-=====
-
-Check for and locate installed executables.  Just like unix [which(1)][unix_which], except:
-
-* Doesn't shell out (fast).
-* Cross-platform (works on windows).  
-
-## Install
-
-```shell
-pub global activate den
-den install which
-```
-
-## Usage
-
-```dart
-import 'dart:io';
-
-import 'package:which/which.dart';
-
-main(arguments) async {
-
-  // Asynchronously
-  var git = await which('git', orElse: () => null);
-
-  // Or synchronously
-  var git = whichSync('git', orElse: () => null);
-
-  if (git == null) {
-    print('Please install git and try again');
-    exit(1);
-  }
-
-  await Process.run(git, ['add', '-A']);
-  await Process.run(git, ['commit', '-m', arguments.first]);
-}
-```
-
-[unix_which]: http://en.wikipedia.org/wiki/Which_%28Unix%29