pull: fix Homebrew Testing pull regression.

Don't fail if we fail to parse an issue when pulling.

While we're here, do some general code cleanup of stuff that's hard to
follow, named confusingly or duplicated unnecessarily.

Merge pull request #6422 from Homebrew/dependabot/bundler/Library/Homebrew/mime-types-data-3.2019.0904

build: bump mime-types-data from 3.2019.0331 to 3.2019.0904 in /Library/Homebrew

build: bump mime-types from 3.2.2 to 3.3 in /Library/Homebrew

Bumps [mime-types](https://github.com/mime-types/ruby-mime-types) from 3.2.2 to 3.3.
- [Release notes](https://github.com/mime-types/ruby-mime-types/releases)
- [Changelog](https://github.com/mime-types/ruby-mime-types/blob/master/History.md)
- [Commits](https://github.com/mime-types/ruby-mime-types/compare/v3.2.2...v3.3

)

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

Bumps [mime-types-data](https://github.com/mime-types/mime-types-data) from 3.2019.0331 to 3.2019.0904.
- [Release notes](https://github.com/mime-types/mime-types-data/releases)
- [Changelog](https://github.com/mime-types/mime-types-data/blob/master/History.md)
- [Commits](https://github.com/mime-types/mime-types-data/compare/v3.2019.0331...v3.2019.0904

)

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

workflows: revise `apidoc` workflow

New Maintainer Checklist: add guidelines for members

workflows: add `apidoc` workflow for rubydoc.brew.sh

build: bump html-proofer from 3.11.1 to 3.12.0 in /docs

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.11.1 to 3.12.0.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.11.1...v3.12.0

)

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

README: add @chenrui333

man: include global options with customized descriptions

Check binary URL resources with RuboCop

- Migrate the existing binary URL audit to a RuboCop.
- Check resources as well as main URLs
- Also check for "macos" and "osx" in URLs
- Add whitelists for URLs and formulae

build: bump addressable from 2.6.0 to 2.7.0 in /docs

MacOSRequirement: add to_json method

build: bump parser from 2.6.3.0 to 2.6.4.0 in /Library/Homebrew

Bumps [parser](https://github.com/whitequark/parser) from 2.6.3.0 to 2.6.4.0.
- [Release notes](https://github.com/whitequark/parser/releases)
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/whitequark/parser/compare/v2.6.3.0...v2.6.4.0

)

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

Bumps [addressable](https://github.com/sporkmonger/addressable) from 2.6.0 to 2.7.0.
- [Release notes](https://github.com/sporkmonger/addressable/releases)
- [Changelog](https://github.com/sporkmonger/addressable/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sporkmonger/addressable/compare/addressable-2.6.0...addressable-2.7.0

)

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

python_virtualenv_constants: upgrade virtualenv to 16.7.4

breadth-first search for dependents upgrade

Fixes Homebrew/brew#6386

Improve ZSH completion so local formula files are completable

* brew completion in ZSH currently doesn't complete local formula files for most commands.
* Updating the completion script to complete formula files as well as known formulas in places that it would makes sense to do so.
* This includesFixes to __brew_formula_or_ruby_files
  * Remove redundant call to uncached brew search
  * Add missing ""

Remove `brew cask automerge`.

messages_spec: handle frozen Homebrew.args.

This is an order dependent test failure fix as seen in
https://travis-ci.org/Homebrew/homebrew-test-bot/builds/574559080

Use `MacOSRequirement` for casks.