docs(readme): clarify which API key to use (#723)
docs(readme): clarify which API key to use (#723)

* docs(readme): clarify which API key to use

fixes #722

* Update README.md

algolia/algoliasearch-client-javascript,algolia/algoliasearch-client-js,algolia/algoliasearch-client-javascript,algolia/algoliasearch-client-javascript,algolia/algoliasearch-client-js,algolia/algoliasearch-client-js,algolia/algoliasearch-client-javascript