Sourced from thor's changelog.

1.0.0

• Drop support to Ruby 1.8 and 1.9.

• Deprecate relying on default exit_on_failure?.
  In preparation to make Thor commands exit when there is a failure we are deprecating
  defining a command without defining what behavior is expected when there is a failure.

  To fix the deprecation you need to define a class method called exit_on_failure? returning

  false if you want the current behavior or true if you want the new behavior.

• Deprecate defining an option with the default value using a different type as defined in the option.

• Allow options to be repeatable. See #674.

0.20.3

• Support old versions of did_you_mean.

0.20.2

• Fix did_you_mean support.

0.20.1

• Support new versions of ERB.
• Fix check_unknown_options! to not check the content that was not parsed, i.e. after a -- or after the first unknown with stop_on_unknown_option!
• Add did_you_mean support.

0.20.0

• Add check_default_type! to check if the default value of an option matches the defined type.
  It removes the warning on usage and gives the command authors the possibility to check for programming errors.

• Add disable_required_check! to disable check for required options in some commands.
  It is a substitute of disable_class_options that was not working as intended.

• Add inject_into_module.

0.19.4, release 2016-11-28

• Rename Thor::Base#thor_reserved_word? to #is_thor_reserved_word?

0.19.3, release 2016-11-27

• Output a warning instead of raising an exception when a default option value doesn't match its specified type

0.19.2, release 2016-11-26

• Fix bug with handling of colors passed to ask (and methods like yes? and no? which it underpins)
• Allow numeric arguments to be negative
• Ensure that default option values are of the specified type (e.g. you can't specify "foo" as the default for a numeric option), but make symbols and strings interchangeable
• Add Thor::Shell::Basic#indent method for intending output
• Fix remove_command for an inherited command (see #451)
• Allow hash arguments to only have each key provided once (see #455)
• Allow commands to disable class options, for instance for "help" commands (see #363)
• Do not generate a negative option (--no-no-foo) for already negative boolean options (--no-foo)
• Improve compatibility of Thor::CoreExt::HashWithIndifferentAccess with Ruby standard library Hash
• Allow specifying a custom binding for template evaluation (e.g. #key? and #fetch)
• Fix support for subcommand-specific "help"s

... (truncated)

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