Update Symfony component requirements to allow 3.0+ #3453
Merged
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Drupal 8.4 updates Symfony component requirements to ~3.2, so will conflict with the current ~2.8 requirement.
The following PRs will also be needed:
Drupal 8.3 projects will continue to install Symfony 2.8 components where they are requirements of both drupal/core and drupal/console due to Drupal 8.3's constraint of ~2.8, but components that are only requirements of drupal/console may be updated to 3.x versions. This shouldn't be a problem as long as drupal/console doesn't use any deprecated features in those 2.8 components.
Fixes #3353, Fixes #3317, Fixes #3293