Table format output has unexpected symfony dependency

[brettgoss]

Summary
When trying to run this plugin for the first time, I received a fatal error complaining about symfony/console. It looks like there might be a dependency on symfony/console that is not listed as a requirement?

Note that this only seems to be an issue with the table format (which is the default output). If I run composer check-licenses -f json, the plugin works as expected.

To Reproduce

1. Install this plugin in a project either without symfony installed, or with symfony 4.4.* installed
2. Run composer check-licenses

Stack Trace

PHP Fatal error:  Uncaught Error: Call to undefined method Symfony\Component\Console\Helper\TableStyle::setVerticalBorderChars() in vendor/metasyntactical/composer-plugin-license-check/src/Command/CheckLicensesCommand.php:70
Stack trace:
#0 phar:///usr/local/bin/composer/vendor/symfony/console/Command/Command.php(245): Metasyntactical\Composer\LicenseCheck\Command\CheckLicensesCommand->execute()
#1 phar:///usr/local/bin/composer/vendor/symfony/console/Application.php(835): Symfony\Component\Console\Command\Command->run()
#2 phar:///usr/local/bin/composer/vendor/symfony/console/Application.php(185): Symfony\Component\Console\Application->doRunCommand()
#3 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(310): Symfony\Component\Console\Application->doRun()
#4 phar:///usr/local/bin/composer/vendor/symfony/console/Application.php(117): Composer\Console\Application->doRun()
#5 phar:///usr/local/bin/composer/src/Composer/Console/Application.php(122): Symfony\Component\Console\Application->run()
#6 phar:// in vendor/metasyntactical/composer-plugin-license-check/src/Command/CheckLicensesCommand.php on line 70