support latest pkg:json_annotation (dart-lang/timing#9)

pkgs/timing/CHANGELOG.md

diff --git a/pkgs/timing/CHANGELOG.md b/pkgs/timing/CHANGELOG.md
index 7b73c71..a8ae834 100644
--- a/pkgs/timing/CHANGELOG.md
+++ b/pkgs/timing/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.1+1
+
+- Support the latest version of `package:json_annotation`.
+
 ## 0.1.1
 
 - Add JSON serialization

pkgs/timing/pubspec.yaml

diff --git a/pkgs/timing/pubspec.yaml b/pkgs/timing/pubspec.yaml
index 54d619c..25d8124 100644
--- a/pkgs/timing/pubspec.yaml
+++ b/pkgs/timing/pubspec.yaml
@@ -1,5 +1,5 @@
 name: timing
-version: 0.1.2-dev
+version: 0.1.1+1
 description: Timing is a simple package for tracking performance of both async and sync actions
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/timing
@@ -8,7 +8,7 @@
   sdk: ">=2.0.0 <3.0.0"
 
 dependencies:
-  json_annotation: ^1.0.0
+  json_annotation: '>=1.0.0 <3.0.0'
 
 dev_dependencies:
   build_runner: ^1.0.0