Move releases/changes to CHANGELOG.md

Check if model exist when creating a resource when it's impossible to…

… satisfy dependencies

Fixes a problem where Nova can't resolve custom ActionRequest

v1.2.4

Fixed belongs-to/morph-to as nested fields and added missing methods …

…in validation rules

Updated build and README to 1.2.2

Add support for BelongsTo and MorphTo relations

v1.2.0 working version with Laravel 5.8|6.0 and Nova 2.x

fixes