Use pkg/test

R=sgjesse@google.com

Review URL: https://codereview.chromium.org//1317773003 .
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 98abd3a..a76441f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 0.9.4
+
+* Updated Dart SDK requirement to `>= 1.8.3 <2.0.0`
+
 # 0.9.3
 
 * Fixed erroneous behavior for listening and when pausing/resuming
diff --git a/pubspec.yaml b/pubspec.yaml
index 892fbb0..e90b74c 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -4,6 +4,6 @@
 description: Helper-package for working with MIME.
 homepage: https://www.github.com/dart-lang/mime
 environment:
-  sdk: '>=1.0.0 <2.0.0'
+  sdk: '>=1.8.3 <2.0.0'
 dev_dependencies:
-  unittest: '>=0.9.0 <0.12.0'
+  test: '^0.12.0'
diff --git a/test/mime_multipart_transformer_test.dart b/test/mime_multipart_transformer_test.dart
index 5038999..95e90bc 100644
--- a/test/mime_multipart_transformer_test.dart
+++ b/test/mime_multipart_transformer_test.dart
@@ -5,7 +5,7 @@
 import 'dart:async';
 import 'dart:math';
 
-import "package:unittest/unittest.dart";
+import "package:test/test.dart";
 import "package:mime/mime.dart";
 
 void _writeInChunks(List<int> data,
diff --git a/test/mime_type_test.dart b/test/mime_type_test.dart
index 23cc10e..c784343 100644
--- a/test/mime_type_test.dart
+++ b/test/mime_type_test.dart
@@ -4,7 +4,7 @@
 
 import 'dart:math' as math;
 
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 import 'package:mime/mime.dart';
 import 'package:mime/src/magic_number.dart';