Merge a985f0a5

[jonchang]

Conflicts: Library/Homebrew/cmd/update-report.rb Library/Homebrew/dev-cmd/man.rb Library/Homebrew/formula_installer.rb Library/Homebrew/manpages/brew.1.md.erb Library/Homebrew/test/cleanup_spec.rb README.md docs/Manpage.md manpages/brew.1

[iMichka]

I triggered a new CI build on Travis, it failed due some timeouts downloading dependencies.

[sjackman]

The purpose of this merge PR is to pull in upstream PR https://github.com/Homebrew/brew/pull/4659: Always fetch at least the latest tag.

[sjackman]

Upstream PR https://github.com/Homebrew/brew/pull/4658 Setinitial_versiontonilwhengit describefails. is also useful, and is a better fix for my PR https://github.com/Linuxbrew/brew/pull/779 update-report: Work around an unusual error

[jonchang]

Merged. Thanks all!

[iMichka]

Thanks for the merge!

[codecov-io]

Codecov Report

Merging #786 into master will decrease coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #786      +/-   ##
==========================================
- Coverage   70.48%   70.43%   -0.05%     
==========================================
  Files         384      384              
  Lines       20527    20632     +105     
==========================================
+ Hits        14469    14533      +64     
- Misses       6058     6099      +41

Impacted Files	Coverage Δ
cleanup.rb	83.33% <0%> (-13.64%)	:arrow_down:
extend/os/mac/diagnostic.rb	35.29% <0%> (-1.85%)	:arrow_down:
formula_installer.rb	63.31% <0%> (-0.46%)	:arrow_down:
os/mac/sdk.rb	38.33% <0%> (-0.38%)	:arrow_down:
extend/os/mac/extend/ENV/super.rb	82.05% <0%> (-0.23%)	:arrow_down:
software_spec.rb	89.68% <0%> (-0.09%)	:arrow_down:
rubocops/class_cop.rb	100% <0%> (ø)	:arrow_up:
dev-cmd/bump-formula-pr.rb	0% <0%> (ø)	:arrow_up:
cask/lib/hbc/audit.rb	92.85% <0%> (+0.03%)	:arrow_up:
cask/lib/hbc/cask_loader.rb	94.11% <0%> (+0.04%)	:arrow_up:
... and 8 more

---

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