Update ruby-enum requirement from ~> 0.7.2 to ~> 0.9.0

[dependabot-preview[bot]]

Updates the requirements on ruby-enum to permit the latest version.

Changelog

Sourced from ruby-enum's changelog.

0.9.0 (2021/01/21)

• #34: Added support for Ruby 3.0 - @dblock.
• #29: Added superclass values when enumerating with Ruby::Enum#values - @gi.
• #30: Default value to key - @gi.
• #34: Replaced Travis-CI with Github Actions, added Danger PR linter - @dblock.
• #37: Added code coverage - @dblock.

0.8.0 (2020/03/27)

• #22: Added Ruby::Enum#each_key and Ruby::Enum#each_value - @dblock.
• #22: Dropped support for Ruby 2.2 - @dblock.
• #22: Upgraded RuboCop to 0.80.1 - @dblock.

0.7.2 (2017/03/15)

• #18: Added support for non constant definition - @laertispappas.

0.7.1 (2017/02/23)

• #16: Replaced const_missing with const_set - @laertispappas.

0.7.0 (2017/02/21)

• #3: Added support for subclassing an Enum - @laertispappas.

0.6.0 (2016/05/12)

• #12: A Ruby::Enum::Errors::DuplicateKeyError or a Ruby::Enum::Errors::DuplciateKeyValyeError will now be raised when duplicate keys / values are defined - @laertispappas.

0.5.0 (2015/11/20)

• #8: Added Ruby::Enum#key, Ruby::Enum#value, Ruby::Enum#key?, and Ruby::Enum#value? - @dmolesUC3.

0.4.0 (2014/06/29)

• #5: Mixed in Enumerable - @kgann.

0.3.0 (2014/05/19)

• #4: Added Ruby::Enum#map - @ArnaudRinquin.

0.2.1 (2013/05/15)

• Added Ruby::Enum#values, Ruby::Enum#keys and Ruby::Enum#to_h - @dblock.
• A Ruby::Enum::Errors::UninitializedConstantError will now be raised when referencing an undefined enum - @dblock.

0.1.0 (2013/05/14)

• Initial public release, live-coded during May 2013 NYC.rb - @dblock.

Commits

• a288577 Preparing for release, 0.9.0.
• 689a295 Merge pull request #37 from dblock/cc
• b31eb44 Added code coverage.
• 7dc859e Merge pull request #36 from dblock/nitpick-readme
• ca30add Use OrderState throughout README.
• 5a57aec Merge pull request #35 from dblock/ruby-3.0
• 3448b2c Added support for Ruby 3.0.
• 2d8b125 Merge pull request #34 from dblock/danger
• 8503dc3 Replaced Travis-CI with Github Actions, added Danger.
• 8792ca1 values: prepend superclass values (#29)
• Additional commits viewable in compare view

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