Change schema.org identifiers to use https

[caendesilva]

Changes itemtypes to use the https version of schema identifiers. See https://schema.org/docs/faq.html#19

Q: Should we write 'https://schema.org' or 'http://schema.org' in our markup?

There is a general trend towards using 'https' more widely, and you can already write 'https://schema.org' in your structured data. We have migrated the schema.org site itself towards using https: as the default version of the site and our preferred form in examples. However 'http://schema.org' -based URLs in structured data markup will remain widely understood for the foreseeable future and there should be no urgency about migrating existing data. This is a lengthy way of saying that both 'https://schema.org' and 'http://schema.org' are fine.

[codecov]

Codecov Report

Merging #633 (9786656) into master (65b5c13) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master      #633   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity      1011      1011           
===========================================
  Files            125       125           
  Lines           2523      2523           
===========================================
  Hits            2523      2523           

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