Merge pull request Homebrew#7500 from MikeMcQuaid/deps_args_spec

deps_spec: check args.

Merge pull request Homebrew#7453 from bayandin/mirror-use-bintray

dev-cmd/mirror: use Bintray wrapper

Merge pull request Homebrew#7301 from Bo98/cmake-sdkroot

formula: make CMake SDK root choice consistent with superenv (+ SDK root refactoring)

Merge pull request Homebrew#7200 from dawidd6/create-ruby

create: add --ruby option

Merge pull request Homebrew#7136 from gromgit/broken_link

Fix broken link on docs front page

Merge pull request Homebrew#7119 from PtrTeixeira/python-virtualenv-i…

…nstall

python: Use literal "python" for virtualenv path

Merge pull request Homebrew#7109 from CodeMonk/pkg_version_fix

Fix for when version is nil

Merge pull request Homebrew#7100 from Homebrew/dependabot/bundler/Lib…

…rary/Homebrew/nokogiri-1.10.9

build: bump nokogiri from 1.10.8 to 1.10.9 in /Library/Homebrew