prepare for stable, null-safe version (#127)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e05854e..be21202 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 0.17.0-nullsafety.0
+## 0.17.0
 
 - Migrate to null safety.
 - `Font.merge` and `BoxEdge.merge` are now static methods instead of factory
diff --git a/pubspec.yaml b/pubspec.yaml
index 412a235..2656efb 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,15 +1,15 @@
 name: csslib
-version: 0.17.0-nullsafety.0
+version: 0.17.0
 
 description: A library for parsing CSS.
-homepage: https://github.com/dart-lang/csslib
+repository: https://github.com/dart-lang/csslib
 
 environment:
   sdk: '>=2.12.0-0 <3.0.0'
 
 dependencies:
-  source_span: ^1.8.0-nullsafety
+  source_span: ^1.8.0
 
 dev_dependencies:
-  pedantic: ^1.10.0-nullsafety
-  test: ^1.16.0-nullsafety.2
+  pedantic: ^1.10.0
+  test: ^1.16.0