Prepare to release v3.0.4 (#178)

CHANGELOG.md

diff --git a/CHANGELOG.md b/CHANGELOG.md
index aba37cb..86c9378 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
-## 3.0.4-wip
+## 3.0.4
 
+* Fix WebAssembly support.
 * Require Dart 3.4
 
 ## 3.0.3

pubspec.yaml

diff --git a/pubspec.yaml b/pubspec.yaml
index ebc9d92..483eaf5 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: crypto
-version: 3.0.4-wip
+version: 3.0.4
 description: Implementations of SHA, MD5, and HMAC cryptographic functions.
 repository: https://github.com/dart-lang/crypto
 topics: