Update min version of unittest to support development

Review URL: https://codereview.chromium.org//877433003

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.1.1
+
+* Changed maximum version of `unittest` to support development.
+
 # 0.1.0
 
 * First release.

lib/metatest.dart

@@ -214,15 +214,13 @@ String _summarizeTests(Map results) {
 
   buffer.writeln();
 
-  var success = false;
   if (results['passed'] == 0 && results['failed'] == 0 &&
       results['errors'] == 0 && results['uncaughtError'] == null) {
     buffer.write('No tests found.');
     // This is considered a failure too.
   } else if (results['failed'] == 0 && results['errors'] == 0 &&
       results['uncaughtError'] == null) {
     buffer.write('All ${results['passed']} tests passed.');
-    success = true;
   } else {
     if (results['uncaughtError'] != null) {
       buffer.write('Top-level uncaught error: ${results['uncaughtError']}');

pubspec.yaml

@@ -1,9 +1,9 @@
 name: metatest
-version: 0.1.0
+version: 0.1.1
 author: Dart Team <misc@dartlang.org>
 description: A package for testing Dart test frameworks.
 homepage: https://github.com/dart-lang/metatest
 environment:
   sdk: '>=1.0.0 <2.0.0'
 dependencies:
-  unittest: '>=0.11.0 <0.12.0'
+  unittest: '>=0.11.0 <=0.12.0'