Merge Homebrew/15c62dfd0 into Linuxbrew/master

[sjackman]

See https://github.com/Homebrew/brew/pull/4628

[codecov-io]

Codecov Report

Merging #777 into master will increase coverage by 0.02%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #777      +/-   ##
==========================================
+ Coverage   70.45%   70.47%   +0.02%     
==========================================
  Files         386      384       -2     
  Lines       20702    20527     -175     
==========================================
- Hits        14585    14466     -119     
+ Misses       6117     6061      -56

Impacted Files	Coverage Δ
extend/os/mac/unpack_strategy/zip.rb	50% <0%> (-50%)	:arrow_down:
cask/lib/hbc/url.rb	92.3% <0%> (-7.7%)	:arrow_down:
cask/lib/hbc/cli.rb	89.18% <0%> (-0.08%)	:arrow_down:
rubocops/formula_desc_cop.rb	100% <0%> (ø)	:arrow_up:
cask/lib/hbc/cli/fetch.rb	100% <0%> (ø)	:arrow_up:
cask/lib/hbc.rb	100% <0%> (ø)	:arrow_up:
cask/lib/hbc/cli/internal_audit_modified_casks.rb
cask/lib/hbc/download_strategy.rb
cask/lib/hbc/installer.rb	85.23% <0%> (+0.04%)	:arrow_up:
download_strategy.rb	67.5% <0%> (+0.16%)	:arrow_up:
... and 4 more

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