Prepare to publish stable null safety (#28)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b2fa6f..b6e18a0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.1.0
+
+* Stable release for null safety.
+
 ## 1.1.0-nullsafety.3
 
 * Update SDK constraints to `>=2.12.0-0 <3.0.0` based on beta release
diff --git a/pubspec.yaml b/pubspec.yaml
index bace989..4f8cb93 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: clock
-version: 1.1.0-nullsafety.3
+version: 1.1.0
 description: A fakeable wrapper for dart:core clock APIs
 homepage: https://github.com/dart-lang/clock