UPGRADE FROM 3.1 to 3.2
=======================
DependencyInjection
-------------------
* Calling `get()` on a `ContainerBuilder` instance before compiling the
container is deprecated and will throw an exception in Symfony 4.0.
Validator
---------
* `Tests\Constraints\AbstractConstraintValidatorTest` has been deprecated in
favor of `Test\ConstraintValidatorTestCase`.
Before:
```php
// ...
use Symfony\Component\Validator\Tests\Constraints\AbstractConstraintValidatorTest;
class MyCustomValidatorTest extends AbstractConstraintValidatorTest
{
}
```
After:
use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
class MyCustomValidatorTest extends ConstraintValidatorTestCase