Widen version constraint on 'analyzer'.

R=nweiz@google.com
BUG=

Review URL: https://codereview.chromium.org//2392743005 .
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59d191f..328abde 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.12.15+9
+
+* Widen version constraint on `analyzer`.
+
 ## 0.12.15+8
 
 * Make test suites with thousands of tests load much faster on the VM (and
diff --git a/pubspec.yaml b/pubspec.yaml
index a1203e9..0c0086d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,12 +1,12 @@
 name: test
-version: 0.12.15+8
+version: 0.12.15+9
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test
 environment:
   sdk: '>=1.14.0 <2.0.0'
 dependencies:
-  analyzer: '>=0.23.0 <0.29.0'
+  analyzer: '>=0.23.0 <0.30.0'
   args: '^0.13.1'
   async: '^1.8.0'
   barback: '>=0.14.0 <0.16.0'