Merge pull request #575 from adjust/docs-update

Docs update

README.md

@@ -36,7 +36,6 @@ Read this in other languages: [English][en-readme], [中文][zh-readme], [日本
    * [Event tracking](#event-tracking)
       * [Revenue tracking](#revenue-tracking)
       * [Revenue deduplication](#revenue-deduplication)
-      * [In-App Purchase verification](#iap-verification)
       * [Callback parameters](#callback-parameters)
       * [Partner parameters](#partner-parameters)
       * [Callback identifier](#callback-id)
@@ -451,10 +450,6 @@ If you want to track in-app purchases, please make sure to call `trackEvent` aft
 }
 ```
 
-### <a id="iap-verification"></a>In-App Purchase verification
-
-If you want to check the validity of In-App Purchases made in your app using Purchase Verification, adjust's server side receipt verification tool, then check out our iOS purchase SDK and read more about it [here][ios-purchase-verification].
-
 ### <a id="callback-parameters"></a>Callback parameters
 
 You can register a callback URL for your events in your [dashboard]. We will send a GET request to that URL whenever the event is tracked. You can add callback parameters to that event by calling `addCallbackParameter` to the event before tracking it. We will then append these parameters to your callback URL.