[in_app_purchase] Add reference to the codelab in the README (#3896)

* Add reference to the codelab

* Updated version number
diff --git a/packages/in_app_purchase/in_app_purchase/CHANGELOG.md b/packages/in_app_purchase/in_app_purchase/CHANGELOG.md
index 022e39e..3788e7b 100644
--- a/packages/in_app_purchase/in_app_purchase/CHANGELOG.md
+++ b/packages/in_app_purchase/in_app_purchase/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.6.0+1
+
+* Added a reference to the in-app purchase codelab in the README.md.
+
 ## 0.6.0
 
 As part of implementing federated architecture and making the interface compatible for other platforms this version contains the following **breaking changes**:
diff --git a/packages/in_app_purchase/in_app_purchase/README.md b/packages/in_app_purchase/in_app_purchase/README.md
index 74b90fe..eade32c 100644
--- a/packages/in_app_purchase/in_app_purchase/README.md
+++ b/packages/in_app_purchase/in_app_purchase/README.md
@@ -51,6 +51,8 @@
    purchase-handling logic is significantly different for the different
    storefronts.
 
+See also the codelab for [in-app purchases in Flutter](https://codelabs.developers.google.com/codelabs/flutter-in-app-purchases) for a detailed guide on adding in-app purchase support to a Flutter App.
+
 ## Usage
 
 This section has examples of code for the following tasks:
diff --git a/packages/in_app_purchase/in_app_purchase/pubspec.yaml b/packages/in_app_purchase/in_app_purchase/pubspec.yaml
index a91ff26..435e778 100644
--- a/packages/in_app_purchase/in_app_purchase/pubspec.yaml
+++ b/packages/in_app_purchase/in_app_purchase/pubspec.yaml
@@ -1,7 +1,7 @@
 name: in_app_purchase
 description: A Flutter plugin for in-app purchases. Exposes APIs for making in-app purchases through the App Store and Google Play.
 homepage: https://github.com/flutter/plugins/tree/master/packages/in_app_purchase
-version: 0.6.0
+version: 0.6.0+1
 
 dependencies:
   flutter: