Sourced from simple_form's changelog.

4.0.0

Enhancements

• Add bootstrap v4.1 generator template. [m5o](https://github.com/m5o)
• Add Rails 5.2 support. [gobijan](https://github.com/gobijan)
• Add API to register custom components.[feliperenan](https://github.com/feliperenan)
• Allow custom errors classes to inputs.[feliperenan](https://github.com/feliperenan)
• Remove support from Rails 4.0, 4.1 and 4.2. [feliperenan](https://github.com/feliperenan)
• Add support for citext, hstore, json & jsonb column types. [swrobel](https://github.com/swrobel)
• Add :valid_class on input wrapper when value is present and valid [aeberlin](https://github.com/aeberlin), [m5o](https://github.com/m5o)
• Allow :valid_class to inputs when value is present and valid. [m5o](https://github.com/m5o)
• Allow validation classes on input_field. [feliperenan](https://github.com/feliperenan)
• Add basic ActiveStorage support. [murb](https://github.com/murb)

Bug fix

• Fix horizontal form label position, from right to text-right. [cavpollo](https://github.com/cavpollo)
• Add base error display alongside existing errors. [bluefalcon26](https://github.com/bluefalcon26)
• Silent deprication warning for placeholder_text. [moofkit](https://github.com/moofkit)
• Use custom i18n scope for label required html. [tvdeyen](https://github.com/tvdeyen)

3.5.1

Enhancements

• Exclude hidden field when unchecked_value: false. [fschwahn](https://github.com/fschwahn)
• Add frozen_string_literal magic comment to several files. [oniofchaos](https://github.com/oniofchaos)
• Try convert object to model in case we got decorated object [timurvafin](https://github.com/timurvafin)

• From now, if you are using some object that inherits from SimpleDelegator, you must implement
  def to_model; self; end. Otherwise, Simple Form will convert the decorated object to the model
  since SimpleDelegator will delegate it to the model.

• Code cleanup [Fornacula](https://github.com/Fornacula)

Bug fix

• Fix error when the scope from association has parameter. [feliperenan](https://github.com/feliperenan)
• Only call where on associations when they respond to it. [anicholson](https://github.com/anicholson)
• require 'action_pack' before using it. [etagwerker](https://github.com/etagwerker)
• Check if Rails.env is defined. [etagwerker](https://github.com/etagwerker)
• Fix minlength. [mameier](https://github.com/mameier)
• Make errors_on_attribute return [] when not present. [redrick](https://github.com/redrick)
• Fix boolean inputs in nested style for label non-string. [feliperenan](https://github.com/feliperenan)

• 516e31c Release 4.0.0
• 1cb66eb update bootstrap v4.1 generator template (#1569)
• d918f70 Add support for Rails 5.2. (#1543)
• 695880f Update CHANGELOG.md
• 3e8d55b Merge pull request #1560 from tvdeyen/i18n-scope-required-label
• 10c0589 Merge pull request #1564 from plataformatec/plataformatec/frg-allow-validatio...
• 46de30a Merge pull request #1566 from murb/active_storage
• 22e1296 add basic activestorage support
• fad0393 Allow validation classes on input_field
• 102b9eb Merge pull request #1562 from likys/master
• Additional commits viewable in compare view

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