Fix a broken link.

Closes #453

R=devoncarew@google.com

Review URL: https://codereview.chromium.org//2271383002 .
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d8b12bf..cc412c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.12.15+6
+
+* Fix a broken link in the `--help` documentation.
+
 ## 0.12.15+5
 
 * Internal-only change.
diff --git a/lib/src/runner/configuration/args.dart b/lib/src/runner/configuration/args.dart
index b7ac949..f179d80 100644
--- a/lib/src/runner/configuration/args.dart
+++ b/lib/src/runner/configuration/args.dart
@@ -95,7 +95,7 @@
       allowedHelp: {
     'compact': 'A single line, updated continuously.',
     'expanded': 'A separate line for each update.',
-    'json': 'A machine-readable format (see https://goo.gl/0HRhdZ).'
+    'json': 'A machine-readable format (see https://goo.gl/gBsV1a).'
   });
   parser.addFlag("verbose-trace", negatable: false,
       help: 'Whether to emit stack traces with core library frames.');
diff --git a/pubspec.yaml b/pubspec.yaml
index 6ac0f92..77cc1bb 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 0.12.15+5
+version: 0.12.15+6
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test
diff --git a/test/runner/runner_test.dart b/test/runner/runner_test.dart
index d05c58c..875d6ae 100644
--- a/test/runner/runner_test.dart
+++ b/test/runner/runner_test.dart
@@ -84,7 +84,7 @@
 
           [compact]            A single line, updated continuously.
           [expanded]           A separate line for each update.
-          [json]               A machine-readable format (see https://goo.gl/0HRhdZ).
+          [json]               A machine-readable format (see https://goo.gl/gBsV1a).
 
     --verbose-trace            Whether to emit stack traces with core library frames.
     --js-trace                 Whether to emit raw JavaScript stack traces for browser tests.