In the section "Configuring Completions in `bash`", there's a line of code that sets `HOMEBREW_PREFIX` by calling `brew --prefix`, but it's done before calling `type brew` to see if brew exists.  This gives a "-bash: brew: command not found" if you don't have brew installed. That line should be moved inside the `if`.

README: remove Azure Pipelines badge.

We're using GitHub Actions now.

Disable `curl` globbing.

define default prefix constants

also use them to detect if prefix line in bottle block is needed

build: bump minitest from 5.12.0 to 5.12.2 in /Library/Homebrew

build: bump minitest from 5.12.0 to 5.12.2 in /docs

Install bottle deps only when a bottle was poured

Only install the bottle depenencies when a bottle was in fact poured.
In particular, if the dependencies are already satisfied,
then there's no need to install the bottle dependencies.

build: bump faraday from 0.15.4 to 0.16.2 in /docs

Bumps [faraday](https://github.com/lostisland/faraday) from 0.15.4 to 0.16.2.
- [Release notes](https://github.com/lostisland/faraday/releases)
- [Changelog](https://github.com/lostisland/faraday/blob/master/CHANGELOG.md)
- [Commits](https://github.com/lostisland/faraday/compare/v0.15.4...v0.16.2

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [minitest](https://github.com/seattlerb/minitest) from 5.12.0 to 5.12.2.
- [Release notes](https://github.com/seattlerb/minitest/releases)
- [Changelog](https://github.com/seattlerb/minitest/blob/master/History.rdoc)
- [Commits](https://github.com/seattlerb/minitest/commits

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [minitest](https://github.com/seattlerb/minitest) from 5.12.0 to 5.12.2.
- [Release notes](https://github.com/seattlerb/minitest/releases)
- [Changelog](https://github.com/seattlerb/minitest/blob/master/History.rdoc)
- [Commits](https://github.com/seattlerb/minitest/commits

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build: bump rake from 12.3.3 to 13.0.0 in /docs

Bumps [rake](https://github.com/ruby/rake) from 12.3.3 to 13.0.0.
- [Release notes](https://github.com/ruby/rake/releases)
- [Changelog](https://github.com/ruby/rake/blob/master/History.rdoc)
- [Commits](https://github.com/ruby/rake/compare/v12.3.3...v13.0.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build: bump rubocop-rspec from 1.35.0 to 1.36.0 in /Library/Homebrew

Bumps [rubocop-rspec](https://github.com/rubocop-hq/rubocop-rspec) from 1.35.0 to 1.36.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-rspec/compare/v1.35.0...v1.36.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

create: add --perl option

Add workaround for `curl: (56) Unexpected EOF`.

cli_args: Fix options_only and flags_only

build: bump rubyzip from 1.2.4 to 2.0.0 in /docs

build: bump html-proofer from 3.12.2 to 3.13.0 in /docs

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.12.2 to 3.13.0.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.12.2...v3.13.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bumps [rubyzip](https://github.com/rubyzip/rubyzip) from 1.2.4 to 2.0.0.
- [Release notes](https://github.com/rubyzip/rubyzip/releases)
- [Changelog](https://github.com/rubyzip/rubyzip/blob/master/Changelog.md)
- [Commits](https://github.com/rubyzip/rubyzip/compare/v1.2.4...v2.0.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

create: add --rust option

create: add --python option

formula_installer: output better tapped formula message.

If we don't have a tab in the receipt then don't print this message and
just continue as-is.