Update initializers so they only include assets for >=Rails 5. Dropped support for <Rails 5.

What's Changed

• Reverted:

Replace / with math.div per Dart Sass 2.0.0 updates. Thanks to @dkjensen for raising the issue and @jclusso for merging the migration."

For context see : #1106 (comment)

Changed

• Replace / with math.div per Dart Sass 2.0.0 updates. Thanks to @dkjensen for raising the issue and @jclusso for merging the migration.

Added

• Improved error handling of unsupported font file formats in the font-face
  mixin (supported formats are woff2 and woff).
• CSS var() and env() functions are now accepted as values in the
  position and size mixins.

Changed

• Updated thor from 0.x to 1.x

Removed

• The font-face mixin no longer supports ttf, svg, and eot
  font file formats.

Removed

• Installation through Bower is no longer supported.
• The sass gem (the deprecated Ruby Sass) is no longer a runtime dependency.

Added

• $font-stack-system now includes the system-ui value.

Changed

• The _gamma function will use a pow function, if available.

Fixed

• Fixed an issue that would cause Bourbon to not be found when using SassC.

Bourbon 5.0.0 is a major release with lots of changes and removals, which are documented in the change log in each of the alpha and beta releases. There are no changes between v5.0.0-beta.8 and v5.0.0. For information on how to upgrade from v4 to v5, read our migrating guide.

Added

• A style property has been added to our package.json, which makes for easy
  importing when using npm-sass, sass-module-importer and others.

Changed

• The triangle mixin no longer has default argument values. The order of the
  arguments also changed: $width and $height now come before $color.

Fixed

• The bourbon update CLI command now works when Bourbon is installed using a
  custom path.
• Fixed an issue that would cause Bourbon to not be found within Rails apps.

Changed

• Updated deprecation warning message for strip-units. (#1016)