version 4.0

Features / Improvements

upgrade to Rails 5.2
upgrade gems in order to fix vulnerabilities
implement sections (https://doc.locomotivecms.com/v4.0/docs/section-introduction)
implement custom routes (https://doc.locomotivecms.com/v4.0/docs/custom-routes)
use Webpack within Wagon to manage assets (js/css) (https://doc.locomotivecms.com/v4.0/docs/manage-js-and-css-with-webpack)
allow to group content type fields in the UI (group is a new option of a content type field)
modify the behavior of the wagon sync command
write documentation about undocumented Liquid date filters: beginningof, endof, adjust_date
add Google reCAPTCHA support (https://doc.locomotivecms.com/v4.0/docs/create-a-contact-form)

fix issue #1210 (engine only consider hardcoded (site.yml) fields and not engine values)
fix issue #1228 (Renaming related item, clears all relationships - many_to_many relationship)
fix issue #1220 (Can't upload font license)
fix issue #1205 (Update metafields throught the API)
fix issue #1233 (Editing options of a select field)
fix issue #1240 (Aws::S3::Errors::NotFound)
fix issue #1195 (validation errors on redirect_url for localized sites)