0.13.1

Added

• Config::arrayFromEnv(?array $env = null, string $prefix = 'INDEXNOW_'): array (wave N, spec 19b §3.3): the
  INDEXNOW_* variables fromEnv() reads, as the nested array fromArray() takes and holding only the variables
  that are set (values as strings, fromArray() coerces them). What an application without a framework merges over
  its configuration file with the environment on top — toArray() carries every default and cannot serve there.
  fromEnv() is now fromArray(arrayFromEnv()); Config::fromArray(Config::arrayFromEnv($env)) equals
  Config::fromEnv($env), and a test keeps it so. The indexnow CLI (indexnowkit/cli) reads its configuration this
  way. Call tier. Released as a patch (0.13.1) although it is an addition: the family's cascade rule (spec 19b §4)
  — a ^0.14 would force a release of every package that requires core ^0.13, for one method none of them calls.