Update install.md for ios: Mapbox Maps SDK (#1106)

* 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. * Update install.md * Removed section for deprecated version
rnmapbox · Nov 20, 2020 · 000616c · 000616c
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diff --git a/ios/install.md b/ios/install.md
@@ -31,4 +31,20 @@ Mapbox normally [requires](https://github.com/mapbox/mapbox-gl-native-ios/issues
 
 ```
 
+## Mapbox Maps SDK
 
+It is possible to set a custom version of the Mapbox SDK: 
+
+### New version - since `8.1rc5`
+
+Add the following to you `ios/Podfile`:
+
+```ruby
+$ReactNativeMapboxGLIOSVersion = '~> 6.1'
+```
+
+Check the current version of the SDK [here](https://docs.mapbox.com/ios/maps/overview/).
+
+### Mapbox Maps SDK > `v6.0.0`
+
+If you are 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`.