Merge pull request #16 from JoseVila/jv/MMC-2005_Update_SDK_Github_for_Public_Beta

[MMC-2005] Update SDK Github README.md for Public Beta

Author: JoseVila

README.md

@@ -1,6 +1,3 @@
-# Interested in joining our beta?
-The Mailchimp SDK is currently in a private beta. If you'd like to join the beta send your Mailchimp username to [[email protected]](mailto:[email protected]?subject=I%27d%20like%20to%20join%20the%20Mailchimp%20SDK%20Private%20Beta).
-
 [<img width="250" height="119" src="https://developer.mailchimp.com/documentation/mailchimp/img/lockup.svg"/>](http://www.mailchimp.com)
 
 # Mailchimp Android SDK
@@ -19,7 +16,7 @@ Create and update your Mailchimp contacts from your Android app. The Mailchimp S
 
 ### Retrieving SDK Key
 
-The Mailchimp SDK is currently in a private beta. If you'd like to join the beta send your Mailchimp username to [[email protected]](mailto:mobile-sdk@mailchimp.com?subject=I%27d%20like%20to%20join%20the%20Mailchimp%20SDK%20Private%20Beta).
+See the [Mailchimp SDK documentation](https://mailchimp.com/developer/guides/mobile-sdk-android/#Step_1._Retrieve_the_SDK_Key) for details on retrieving a key.
 
 ### Adding The Mailchimp SDK to your Project
 
@@ -197,7 +194,8 @@ See the [Mailchimp GDPR Tutorial](https://mailchimp.com/help/collect-consent-wit
 ```
 
 #### Retrieving Marketing Permission Keys
-Coming Soon
+
+See the [Mailchimp SDK documentation](https://mailchimp.com/developer/guides/mobile-sdk-android-use/#Marketing_Permissions) for details on setting up marketing permissions.
 
 ## Collecting contact events