Fix schema org protocol

[protoroto]

Description

Fix schema.org procol:

• original commit taken from Update meta.py changed http to https #152 by @svandeneertwegh
• fix tests and ci

References

Original pr: #152

Checklist

• I have read the contribution guide
• Code lint checked via inv lint
• changes file included (see docs)
• Usage documentation added in case of new features
• Tests added

[coveralls]

coverage: 98.246%. remained the same when pulling 2fda34e on protoroto:bugfix/152-fix-schema-org-protocol into 17e4fb9 on nephila:develop.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (17e4fb9) 97.58% compared to head (2fda34e) 97.58%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #161   +/-   ##
========================================
  Coverage    97.58%   97.58%           
========================================
  Files            8        8           
  Lines          456      456           
  Branches        78       78           
========================================
  Hits           445      445           
  Misses           8        8           
  Partials         3        3           

Flag	Coverage Δ
unittests	97.36% <100.00%> (ø)

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Files Changed	Coverage Δ
meta/templatetags/meta.py	100.00% <100.00%> (ø)

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