Prepare to publish for stable null safety (#45)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8a9af55..c342d97 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.1.0
+
+* Stable release for null safety.
+
 ## 1.1.0-nullsafety.5
 
 * Update sdk constraints to `>=2.12.0-0 <3.0.0` based on beta release
diff --git a/pubspec.yaml b/pubspec.yaml
index e568323..13a33c7 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: characters
-version: 1.1.0-nullsafety.5
+version: 1.1.0
 description: String replacement with operations that are Unicode/grapheme cluster aware.
 homepage: https://www.github.com/dart-lang/characters