Update README.md

README.md

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-# Looker Spoke iOS
-Mozilla iOS Looker Models. Creates explores from views defined in the hub [0].
+# Looker Spoke Temporary Default
+Mozilla Looker Models. Creates explores from views defined in the hub [0].
+
+Note: This is a temporary repository that will be replaced by github.com/mozilla/looker-spoke-default
+when Looker allows us to use `main` instead of `master` as the production branch.
 
 [0] https://github.com/mozilla/looker-hub