stable null safety release (#49)

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index ab642b7..cbefda0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 1.0.0-dev
+## 1.0.0
 
 * Migrate to null safety.
 

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index e945e97..76a65c2 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: shelf_static
-version: 1.0.0-dev
+version: 1.0.0
 description: Static file server support for shelf
 repository: https://github.com/dart-lang/shelf_static