followArtistsOrUsers method
Follows users or artists by ids.
type must be either 'artist' or 'user'.
Implementation
Future<void> followArtistsOrUsers(List<String> ids, String type) async {
assert(type == 'artist' || type == 'user', 'Type must be "artist" or "user"');
final uri = Uri.https(
_baseApiHost,
'/v1/me/following',
{'type': type},
);
final body = {'ids': ids};
await _putJson(uri, body);
}