Prepare for publish (#143)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a6b05ad..7ea5e20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 1.6.0-dev
+## 1.6.0
 
 * Remove `help` from the list of commands in usage.
 * Remove the blank lines in usage which separated the help for options that
diff --git a/pubspec.yaml b/pubspec.yaml
index 865a7a9..47f5c40 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: args
-version: 1.6.0-dev
+version: 1.6.0
 homepage: https://github.com/dart-lang/args
 description: >-
  Library for defining parsers for parsing raw command-line arguments into a set