Update charted to 0.4.8 and roll

packages/quiver/lib/pattern.dart

Index: packages/quiver/lib/pattern.dart
diff --git a/packages/quiver/lib/pattern.dart b/packages/quiver/lib/pattern.dart
index 937b0a06a61074799b1b58de0659e16893e8ddcb..31a7cfb98561a3da5fece98648aea76bfe98c33a 100644
--- a/packages/quiver/lib/pattern.dart
+++ b/packages/quiver/lib/pattern.dart
@@ -50,7 +50,7 @@ class _MultiPattern extends Pattern {
       {Iterable<Pattern> this.exclude});
 
   Iterable<Match> allMatches(String str, [int start = 0]) {
-    var _allMatches = [];
+    final _allMatches = <Match>[];
     for (var pattern in include) {
       var matches = pattern.allMatches(str, start);
       if (_hasMatch(matches)) {
@@ -61,15 +61,15 @@ class _MultiPattern extends Pattern {
             }
           }
         }
-        _allMatches.add(matches);
+        _allMatches.addAll(matches);
       }
     }
-    return _allMatches.expand((x) => x);
+    return _allMatches;
   }
 
   Match matchAsPrefix(String str, [int start = 0]) {
-    return allMatches(str).firstWhere((match) => match.start == start,
-        orElse: () => null);
+    return allMatches(str)
+        .firstWhere((match) => match.start == start, orElse: () => null);
   }
 }