stable null safety release (dart-lang/http_multi_server#33)

pkgs/http_multi_server/CHANGELOG.md

diff --git a/pkgs/http_multi_server/CHANGELOG.md b/pkgs/http_multi_server/CHANGELOG.md
index 5d90eaf..3368ca3 100644
--- a/pkgs/http_multi_server/CHANGELOG.md
+++ b/pkgs/http_multi_server/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 3.0.0-dev
+## 3.0.0
 
 * Migrate to null safety.
 

pkgs/http_multi_server/pubspec.yaml

diff --git a/pkgs/http_multi_server/pubspec.yaml b/pkgs/http_multi_server/pubspec.yaml
index 3593fc1..33f2f91 100644
--- a/pkgs/http_multi_server/pubspec.yaml
+++ b/pkgs/http_multi_server/pubspec.yaml
@@ -1,5 +1,5 @@
 name: http_multi_server
-version: 3.0.0-dev
+version: 3.0.0
 
 description: >-
   A dart:io HttpServer wrapper that handles requests from multiple servers.