Acts As Commentable with Threading v2.0.0 Release Notes

    • ✂ Removed support for Rails 3.x - gem only supports Rails 4+ going forward.
    • ⚡️ Updated rspec versions to 3.x and switch to 'expect' syntax.
    • ✂ Removed default values from referencing id columns in Comment class.
    • ➕ Added missing '.rb' suffix on migration files.