rev to 1.0.0 (#185)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8e38f27..70e7747 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.0.0
+
+- Rev to `1.0.0` (note however that there are no API changes from `0.17.x`).
+
 ## 0.17.3
 
 - Add markdown badges to the readme.

diff --git a/pubspec.yaml b/pubspec.yaml
index 8772246..e0eab9a 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml

@@ -1,5 +1,5 @@
 name: csslib
-version: 0.17.3
+version: 1.0.0
 description: A library for parsing and analyzing CSS (Cascading Style Sheets).
 repository: https://github.com/dart-lang/csslib