Please add support for upcomming Symfony 5.x

composer require aws/aws-sdk-php-symfony

results currently in:

./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Restricting packages listed in "symfony/symfony" to "5.0.*"
Your requirements could not be resolved to an installable set of packages.

Problem 1
- Installation request for aws/aws-sdk-php-symfony dev-master -> satisfiable by aws/aws-sdk-php-symfony[dev-master].
- aws/aws-sdk-php-symfony dev-master requires symfony/config ~2.3|~3.0|~4.0 -> no matching package found.

Potential causes:

• A typo in the package name
• The package is not available in a stable-enough version according to your minimum-stability setting
  see https://getcomposer.org/doc/04-schema.md#minimum-stability for more details.
• It's a private package and you forgot to add a custom repository to find it

Read https://getcomposer.org/doc/articles/troubleshooting.md for further common problems.