Fix Dart 2 type error in share plugin (#393)

diff --git a/packages/share/CHANGELOG.md b/packages/share/CHANGELOG.md
index df79323..f6ef76d 100644
--- a/packages/share/CHANGELOG.md
+++ b/packages/share/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.3.2
+
+* Fixed Dart 2 type error.
+
 ## 0.3.1
 
 * Simplified and upgraded Android project template to Android SDK 27.
diff --git a/packages/share/lib/share.dart b/packages/share/lib/share.dart
index fdc3f95..4bd98af 100644
--- a/packages/share/lib/share.dart
+++ b/packages/share/lib/share.dart
@@ -16,7 +16,7 @@
 ///
 /// May throw [PlatformException] or [FormatException]
 /// from [MethodChannel].
-Future<Null> share(String text) {
+Future<void> share(String text) {
   assert(text != null && text.isNotEmpty);
   return _kChannel.invokeMethod('share', text);
 }
diff --git a/packages/share/pubspec.yaml b/packages/share/pubspec.yaml
index 892996d..24e0bcb 100644
--- a/packages/share/pubspec.yaml
+++ b/packages/share/pubspec.yaml
@@ -1,7 +1,7 @@
 name: share
 description: Flutter plugin for sharing content via the platform share UI, using
   the ACTION_SEND intent on Android and UIActivityViewController on iOS.
-version: 0.3.1
+version: 0.3.2
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/share