The LICENSE.md currently reads:
Copyright (c) 2016 - present
This does not name a copyright holder. The MIT license requires that "the above copyright notice" be included in all copies — but the notice is incomplete.
package.json correctly identifies Tim Berners-Lee as the author (first commit May 3, 2016).
Proposed fix:
Copyright (c) 2016 - present Tim Berners-Lee and contributors