1.5.3

• Make pinning more robust (@MikeMcQuaid)
• utils: no .metadata deprecations. (@MikeMcQuaid)
• docs: add more option descriptions (@EricFromCanada)
• audit: Remove FILEUTILS_METHODS constant (@woodruffw)
• add ALL_PROXY for brew (@xiehuc)
• tap: don’t tap deprecated taps. (@MikeMcQuaid)
• bump-formula-pr: more enhancements. (@ilovezfs)
• xcode_requirement: inform users of macOS upgrade. (@MikeMcQuaid)
• Don't suggest install from bottle if not available (@alyssais)
• cask style: fix --fix (@commitay)
• Fix brew cask style on Travis. (@reitermarkus)
• Minor proposal (@kant)
• Add Hbc::Config class. (@reitermarkus)
• travis.yml: HOME Ruby path caching not needed. (@MikeMcQuaid)
• .travis.yml: make configuration tweaks. (@MikeMcQuaid)
• Fix Travis deprecation error. (@reitermarkus)
• bump-formula-pr: only validate tar files. (@ilovezfs)