publish 2.1.0 (#191)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index edac237..37d6220 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,4 @@
-## 2.1.0-dev
+## 2.1.0
 
 * Add a `mandatory` argument to require the presence of an option.
 * Add `aliases` named argument to `addFlag`, `addOption`, and `addMultiOption`,
diff --git a/pubspec.yaml b/pubspec.yaml
index c980dba..915493b 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: args
-version: 2.1.0-dev
+version: 2.1.0
 homepage: https://github.com/dart-lang/args
 description: >-
  Library for defining parsers for parsing raw command-line arguments into a set