Mark in_app_purchase as stable (#3929)

diff --git a/packages/in_app_purchase/in_app_purchase/CHANGELOG.md b/packages/in_app_purchase/in_app_purchase/CHANGELOG.md
index 3788e7b..c195d68 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 @@
+## 1.0.0
+
+* Stable release of in_app_purchase plugin.
+
 ## 0.6.0+1
 
 * Added a reference to the in-app purchase codelab in the README.md.
diff --git a/packages/in_app_purchase/in_app_purchase/README.md b/packages/in_app_purchase/in_app_purchase/README.md
index eade32c..4e10463 100644
--- a/packages/in_app_purchase/in_app_purchase/README.md
+++ b/packages/in_app_purchase/in_app_purchase/README.md
@@ -5,9 +5,6 @@
 This plugin supports in-app purchases (_IAP_) through an _underlying store_,
 which can be the App Store (on iOS) or Google Play (on Android).
 
-> This plugin is in beta. Use it with caution and
-> [file any potential issues you see](https://github.com/flutter/flutter/issues/new/choose).
-
 <p>
   <img src="https://github.com/flutter/plugins/blob/master/packages/in_app_purchase/in_app_purchase/doc/iap_ios.gif?raw=true"
     alt="An animated image of the iOS in-app purchase UI" height="400"/>
diff --git a/packages/in_app_purchase/in_app_purchase/pubspec.yaml b/packages/in_app_purchase/in_app_purchase/pubspec.yaml
index 435e778..1e8a150 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+1
+version: 1.0.0
 
 dependencies:
   flutter: