Upgrading guide.

Author: binaryk

UPGRADING.md

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+# Upgrading
+
+Because there are many breaking changes an upgrade is not that easy. There are many edge cases this guide does not cover. We accept PRs to improve this guide.
+
+## From v3 to v4
+
+- Dropped support for laravel passport
+- The default exception handler is the Laravel one, see `restify.php -> handler`
+- `fillCallback` signature has changed
+- By default it will do not allow you to attach `belongsToMany` and `morphToMany` relationships. You will have to add `BelongsToMany` or `MorphToMany` field into your repository
+