Fix Dart 2 type error in package_info (flutter#394)

Author: mravn-google

packages/package_info/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.2.1
+
+* Fix Dart 2 type error.
+
 ## 0.2.0
 
 * **Breaking change**. Introduced class `PackageInfo` in place of individual functions.

packages/package_info/lib/package_info.dart

@@ -32,7 +32,7 @@ class PackageInfo {
       final Completer<PackageInfo> completer = new Completer<PackageInfo>();
 
       _kChannel.invokeMethod('getAll').then((dynamic result) {
-        final Map<String, String> map = result;
+        final Map<dynamic, dynamic> map = result;
 
         completer.complete(new PackageInfo(
           packageName: map["packageName"],

packages/package_info/pubspec.yaml

@@ -1,7 +1,7 @@
 name: package_info
 description: Flutter plugin for querying information about the application
   package, such as CFBundleVersion on iOS or versionCode on Android.
-version: 0.2.0
+version: 0.2.1
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/package_info