Prepare to release v0.3.4 (dart-lang/io#53)

pkgs/io/CHANGELOG.md

diff --git a/pkgs/io/CHANGELOG.md b/pkgs/io/CHANGELOG.md
index e8a1f70..1dcf5b6 100644
--- a/pkgs/io/CHANGELOG.md
+++ b/pkgs/io/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.3.4
+
+* Fix a number of issues affecting the package score on `pub.dev`.
+
 ## 0.3.3
 
 * Updates for Dart 2 constants. Require at least Dart `2.0.0-dev.54`.

pkgs/io/pubspec.yaml

diff --git a/pkgs/io/pubspec.yaml b/pkgs/io/pubspec.yaml
index 9ffe6ce..dfb3b49 100644
--- a/pkgs/io/pubspec.yaml
+++ b/pkgs/io/pubspec.yaml
@@ -2,7 +2,7 @@
 description: >-
   Utilities for the Dart VM Runtime including support for ANSI colors,
   file copying, and standard exit code values.
-version: 0.3.4-dev
+version: 0.3.4
 homepage: https://github.com/dart-lang/io
 
 environment: