Make FetchMoreOptions["updateQuery"] optional.
Make FetchMoreOptions["updateQuery"] optional.

Now that the purpose of updateQuery can be achieved through InMemoryCache
field policy merge functions, it's no longer a mistake to call fetchMore
without providing an updateQuery function.

apollographql/apollo-client,apollostack/apollo-client,apollographql/apollo-client,apollostack/apollo-client,apollostack/apollo-client