Merge 1.6.7

[codecov-io]

Codecov Report

Merging #721 into master will decrease coverage by 0.19%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #721     +/-   ##
=========================================
- Coverage   68.51%   68.32%   -0.2%     
=========================================
  Files         387      388      +1     
  Lines       20895    20947     +52     
=========================================
- Hits        14317    14311      -6     
- Misses       6578     6636     +58

Impacted Files	Coverage Δ
extend/os/extend/ENV/super.rb	50% <0%> (-50%)	:arrow_down:
linkage_cache_store.rb	84.61% <0%> (-10.63%)	:arrow_down:
cask/lib/hbc/caskroom.rb	85% <0%> (-9.45%)	:arrow_down:
linkage_checker.rb	64.58% <0%> (-4.37%)	:arrow_down:
extend/os/mac/extend/ENV/super.rb	83.54% <0%> (-4.3%)	:arrow_down:
os/mac/xcode.rb	48.48% <0%> (-1.21%)	:arrow_down:
download_strategy.rb	62.16% <0%> (-0.3%)	:arrow_down:
cli_parser.rb	97.05% <0%> (-0.12%)	:arrow_down:
formula.rb	77.63% <0%> (-0.07%)	:arrow_down:
cask/lib/hbc/dsl.rb	94.07% <0%> (-0.05%)	:arrow_down:
... and 20 more

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