Update Symfony dependency constraint

[gapple]

• Remove composer.lock (see hechoendrupal/drupal-console#3447 for corresponding change to drupal/console)
• Update to allow 3.0+ Symfony components for support of Drupal 8.4+

Drupal 8.3 projects will continue to install Symfony 2.8 components where they are requirements of both drupal/core and drupal/console-extend-plugin due to Drupal 8.3's constraint of ~2.8, but components that are only requirements of drupal/console-extend-plugin may be updated to 3.x versions. This shouldn't be a problem as long as drupal/console-extend-plugin doesn't use any deprecated features in those 2.8 components.

[cburschka-pwc]

This still needs to be merged and released in order for 1.0.0-rc26 to work with symfony3 :)

Problem 1

• Installation request for drupal/console ^1.0.0-rc26 -> satisfiable by drupal/console[1.0.0-rc26].
• Conclusion: remove symfony/dependency-injection v3.2.8
• Conclusion: don't install symfony/dependency-injection v3.2.8
• drupal/console 1.0.0-rc26 requires drupal/console-extend-plugin ~0 -> satisfiable by drupal/console-extend-plugin[0.1.0, 0.2.0, 0.3.0, 0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.8.0, 0.9.0, 0.9.1].
• drupal/console-extend-plugin 0.9.1 requires symfony/yaml >=2.7 <3.0 -> satisfiable by symfony/yaml[2.7.x-dev, 2.8.x-dev].
• symfony/yaml 2.7.x-dev conflicts with symfony/dependency-injection[v3.2.8].
• symfony/yaml 2.8.x-dev conflicts with symfony/dependency-injection[v3.2.8].
• Installation request for symfony/dependency-injection (locked at v3.2.8, required as ^3.2) -> satisfiable by symfony/dependency-injection[v3.2.8].

[jmolivas]

@gapple Thanks for your contribution, your PR was merged. This will be included on the next release.

[jmolivas]

@cburschka-pwc Confirmed merging this PR an tagging a new release allows DrupalConsole composer require drupal/console:~1.0 to download. Thanks for testing and commenting.