xcodeproj 1.5.5

on Ruby Gems

Enhancements

• Atomically write project.pbxproj files, so that Xcode will never see them
  in a half-written state.
  Samuel Giddins

• Update default build settings for Xcode 9.3.
  Samuel Giddins

Bug Fixes

• Save .xcscheme files with double-quoted strings, consistent with Xcode.
  Samuel Giddins

• [XCBuildConfiguration] Support environment variables in #resolve_build_setting
  Ruenzuo
  #510

• Ensure --no-ansi disables output of escape sequences.
  Samuel Giddins
  #540