Merge pull request Homebrew#4066 from scpeters/missing_fail

missing: exit nonzero if missing deps are found

Merge pull request Homebrew#4045 from MikeMcQuaid/curlrc-reverse-fix

Only read curlrc if HOMEBREW_CURLRC is set.

Merge pull request Homebrew#4014 from ilovezfs/virtualenv-15.2.0

python_virtualenv_constants: update virtualenv to 15.2.0

Merge pull request Homebrew#3981 from MikeMcQuaid/rspec-cleanup

test: rubocop-rspec style auto-corrects.

Merge pull request Homebrew#3952 from Homebrew/revert-3911-misfeature

Revert "build: do not skip runtime deps of buildtime deps"

Merge pull request Homebrew#3948 from MikeMcQuaid/audit-run

Audit use of :run dependencies.

Merge pull request Homebrew#3902 from MikeMcQuaid/python-binaries

Homebrew-and-Python: update binary locations.

dep*: fix more :test dependency resolution.

Merge pull request Homebrew#3864 from MikeMcQuaid/migrator-upgrade

migrator: recommend upgrade.

Merge pull request Homebrew#3860 from MikeMcQuaid/remove-acceptable-b…

…indings

docs/Acceptable-Formulae: remove bindings mention.