This is the last release to support building with Swift 3.2 and Swift 3.3.
The next release will require Swift 4.0 or higher to build.

Breaking

• None.

Enhancements

• Add LowerACLThanParent rule.
  Keith Smiley
  #2136

• Add UIOffsetMake to legacy_constructor rule.
  Nealon Young
  #2126

• Add a new excluded config parameter to the explicit_type_interface rule
  to exempt certain types of variables from the rule.
  Rounak Jain
  #2028

• Add empty_string opt-in rule to validate against comparing strings to ""
  instead of using .isEmpty.
  Davide Sibilio

• Add untyped_error_in_catch opt-in rule to warn against declaring errors
  without an explicit type in catch statements instead of using the implicit
  error variable.
  Daniel Metzing
  #2045

• Add all keyword for use in disable / enable statement:
  // swiftlint:disable all.
  It allows disabling SwiftLint entirely, in-code, for a particular section.
  fredpi
  #2071

• Adds --force-exclude option to lint and autocorrect commands, which will
  force SwiftLint to exclude files specified in the config excluded even if
  they are explicitly specified with --path.
  Ash Furrow
  #2051

• Adds discouraged_optional_collection opt-in rule to encourage the use of
  empty collections instead of optional collections.
  Ornithologist Coder
  #1885

• Add 4.1.0, 4.1.1 and 4.2.0 to Swift version detection.
  Norio Nomura
  #2143

• Support building with Swift 4.1.
  Norio Nomura
  #2038

Bug Fixes

• Fixes an issue with the yoda_condition rule where the severity would always
  display as a warning, and the reason would display as the severity type.
  Twig

• Fix TODOs lint message to state that TODOs should be resolved instead of
  avoided.
  Adonis Peralta
  #150

• Fix some cases where colon rule wouldn't autocorrect dictionary literals.
  Marcelo Fabri
  #2050

• Fix linux crash on sources with surrogate pair emojis as variable names.
  Cyril Lashkevich

• Make legacy_constructor rule more reliable, especially for autocorrecting.
  Marcelo Fabri
  #2098

• Fix colon rule autocorrect when preprocessor macros are present.
  Marcelo Fabri
  #2099

• Fix crash when saving cache if there're entries referring to the same path
  but with different capitalization.
  Marcelo Fabri
  #2032

• Fix several rules (empty_enum_arguments, explicit_init
empty_parentheses_with_trailing_closure, joined_default_parameter,
  redundant_optional_initialization, redundant_void_return and
  unused_closure_parameter) rules autocorrection inside functions or other
  declarations.
  Marcelo Fabri

• Fix redundant_void_return rule autocorrect when preprocessor macros are
  present.
  John Szumski
  #2115

• Fix issue where the autocorrect done message used the plural form of "files"
  even if only 1 file changed.
  John Szumski

• Fix false positives in attributes rule when using Swift 4.1.
  Marcelo Fabri
  #2125
  #2141