Update install.md

Following ticket https://github.com/react-native-mapbox-gl/maps/issues/1103 to explain how to use a custom version of the Mapbox Maps SDK for iOS.
mzu · Nov 13, 2020 · 8a24127 · 8a24127
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commit 8a24127
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/ios/install.md b/ios/install.md
@@ -30,5 +30,5 @@ Mapbox normally [requires](https://github.com/mapbox/mapbox-gl-native-ios/issues
   use_frameworks!
 
 ```
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+## Mapbox Maps SDK > `v6.0.0`
+It is possible to set a custom version of the Mapbox SDK as described [here](https://github.com/react-native-mapbox-gl/maps/pull/940). If you're using version `v6.0.0` of the SDK or later, you will need to authorize your download of the Maps SDK with a secret access token with the `DOWNLOADS:READ` scope. This [guide](https://docs.mapbox.com/ios/maps/overview/#install-the-sdk) explains how to configure the secret token under section `Configure your secret token`.