Prepare release (#160)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 87671bb..d768748 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 4.1.0
+- Analytics hits can now be batched. See details in the documentation of the
+  `AnalyticsIO` constructor.
+
 ## 4.0.2
 - Fix a bug with the analytics ping throttling algorithm.
 
diff --git a/pubspec.yaml b/pubspec.yaml
index a70557a..8afac29 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -3,14 +3,15 @@
 # BSD-style license that can be found in the LICENSE file.
 
 name: usage
-version: 4.0.2
+version: 4.1.0
 description: A Google Analytics wrapper for command-line, web, and Flutter apps.
 homepage: https://github.com/dart-lang/usage
 
 environment:
-  sdk: '>=2.12.0-0 <3.0.0'
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
+  meta: ^1.7.0
   path: ^1.8.0
 
 dev_dependencies: