Make dependentKeys in GraphQLResult public. (apollographql/apollo-ios-dev#758)

Author: chrsmys

Sources/Apollo/GraphQLResult.swift

@@ -20,7 +20,9 @@ public struct GraphQLResult<Data: RootSelectionSet> {
   /// Source of data
   public let source: Source
 
-  let dependentKeys: Set<CacheKey>?
+  /// The cache keys for the fields that were included in this response. Custom ``ApolloStoreSubscriber``s can use these
+  /// keys to understand when changes to the cache would affect the result of a specific response.
+  public let dependentKeys: Set<CacheKey>?
 
   public init(
     data: Data?,