Ensure Access-Control-Allow-Origin: * when check sri

[ilyalyo]

issue #417

[codecov-io]

Codecov Report

Merging #463 into master will decrease coverage by 0.37%.
The diff coverage is 73.07%.

@@            Coverage Diff             @@
##           master     #463      +/-   ##
==========================================
- Coverage   98.53%   98.16%   -0.38%     
==========================================
  Files          27       27              
  Lines        1777     1795      +18     
==========================================
+ Hits         1751     1762      +11     
- Misses         26       33       +7

Impacted Files	Coverage Δ
lib/html-proofer/url_validator.rb	97.79% <100%> (+0.04%)	⬆️
lib/html-proofer/check/links.rb	98.75% <100%> (ø)	⬆️
lib/html-proofer/runner.rb	93.75% <45.45%> (-5.28%)	⬇️
lib/html-proofer/check.rb	92.85% <88.88%> (-1.59%)	⬇️

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[hanzei]

What is the status of this PR?

[hanzei]

Ping @gjtorikian

[gjtorikian]

This PR will need tests. It seems that fixture files were added, but no tests for them.

[hanzei]

@ilyalyo Could you please add some test to your changes?