Update charted to 0.4.8 and roll

packages/quiver/CHANGELOG.md

+#### 0.25.0 - 2017-03-28
+   * BREAKING CHANGE: minimum SDK constraint increased to 1.21.0. This allows
+     use of async-await and generic function in Quiver.
+   * BREAKING CHANGE: eliminated deprecated `FakeTimer`.
+   * BREAKING CHANGE: `StreamBuffer<T>` now implements `StreamConsumer<T>` as
+     opposed to `StreamConsumer<T|List<T>>`.
+   * Deprecated: `FutureGroup`. Use the replacement in `package:async` which
+     requires a `close()` call to trigger auto-completion when the count of
+     pending tasks drops to 0.
+   * Deprecated: `repeat` in the `strings` library. Use the `*` operator on
+     the String class.
+   * Deprecated: in the strings library, `flip` has been renamed `reverse`.
+     `flip` is deprecated and will be removed in the next release.
+   * Iterables: `enumerate` is now generic.
+   * Collection: added `indexOf`.
+
+#### 0.24.0 - 2016-10-31
+   * BREAKING CHANGE: eliminated deprecated `nullToEmpty`, `emptyToNull`.
+   * Fix: Strong mode: As of Dart SDK 1.21.0, `Set.difference` takes a
+     `Set<Object>` parameter.
+
+#### 0.23.0 - 2016-09-21
+   * Strings: `nullToEmpty`, `emptyToNull` deprecated. Removal in 0.24.0.
+   * BREAKING CHANGE: eliminated deprecated multimap `toMap`.
+   * BREAKING CHANGE: eliminated deprecated `pad*`, `trim*` string functions.
+
+#### 0.22.0 - 2015-04-21
+   * BREAKING CHANGE: `streams` and `async` libraries have been [merged](https://github.com/google/quiver-dart/commit/671f1bc75742b4393e203c9520a3bf1e031967dc) into one `async` library
+   * BREAKING CHANGE: Pre-1.8.0 SDKs are no longer supported.
+   * Quiver is now [strong mode](https://github.com/dart-lang/dev_compiler/blob/master/STRONG_MODE.md) compliant
+   * New: `Optional` now implements `Iterable` and its methods are generic (using temporary syntax)
+   * New: `isNotEmpty` and `isDigit` in `strings.dart`
+   * New: `Multimap.fromIterable`
+   * Fix: Change `TreeSearch` from `class` to `enum`.
+   * Fix: `fake_async.dart` timers are now active while executing the callback
+
 #### 0.21.4 - 2015-05-15
    * Add stats reporting for fake async tests. You can query the number of 
      pending microtasks and timers via `microtaskCount`, `periodicTimerCount`, 
      `nonPeriodicTimerCount`.
                                          
 #### 0.21.3+1 - 2015-05-11
    * Switch from unittest to test.
 
 #### 0.21.3 - 2015-03-03
    * Bugfix: fixed return type on some methods (e.g. `where` of `Iterable`s
@@ skipping 37 matching lines @@
    * Multimap: better `toString()` on returned collections.
    * Multimap: Bugfix: support edits on empty value collections.
    * Multimap: Added missing return statment in `fold`.
    * Added isEmpty() in `strings`.
    * Added max SDK constraint <2.0.0
    * Minor updates to README.md.
    * CHANGELOG.md added
 
 #### 0.19.0+1 - 2014-11-12
    * Corrected version constraint suggestion in README.md.