1.6.0

• Only read curlrc if HOMEBREW_CURLRC is set. (@MikeMcQuaid)
• urls_cop: Search for func calls to match url and mirror calls (@GauthamGoli)
• cli_parser: Common switch options to be accessible across brew (@GauthamGoli)
• compat/formula: remove patches. (@MikeMcQuaid)
• cli_parser: undefine OpenStruct instance tap. (@MikeMcQuaid)
• Tell curl to not use .curlrc (@stefansundin)
• docs/Installation: note curl usage on <=10.7. (@MikeMcQuaid)
• keg: don't remove versioned aliases on unlink. (@MikeMcQuaid)
• linkage_checker: fix detection of broken dependencies and missing libraries (@maxim-belkin)
• bump-formula-pr: Replace hub with GH API calls (@GauthamGoli)
• Simplify search_taps method and handle errors (@SENG480-18)
• Disable/delete more deprecations (@MikeMcQuaid)
• audit (strict): check for build.with? dependencies. (@MikeMcQuaid)
• official_taps: deprecate homebrew/php. (@MikeMcQuaid)
• Fix HOMEBREW_RUBY_WARNINGS="-w" (@MikeMcQuaid)
• docs: update FAQ and Installation. (@MikeMcQuaid)
• Note environment variables need to have values. (@MikeMcQuaid)
• Add message to set_ownership (@commitay)
• brew: Add ScpDownloadStrategy (@ryangreenberg)
• brew create: fix meson template (@tschoonj)
• Maintainer-Guidelines: add communication section. (@MikeMcQuaid)