Prepare to publish (#564)

Add CHANGELOG entry for `retry.dart`.
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2750afd..be521ad 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,7 @@
-## 0.13.2-dev
+## 0.13.2
+
+* Add `package:http/retry.dart` with `RetryClient`. This is the same
+  implementation as `package:http_retry` which will be discontinued.
 
 ## 0.13.1
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 635b795..64a2e90 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: http
-version: 0.13.2-dev
+version: 0.13.2
 homepage: https://github.com/dart-lang/http
 description: A composable, multi-platform, Future-based API for HTTP requests.