Composer update

• Removing phpdocumentor/reflection-common (1.0.1)
• Removing phpdocumentor/reflection-docblock (4.3.4)
• Removing phpdocumentor/type-resolver (0.5.1)
• Removing phpspec/prophecy (v1.10.3)
• Removing phpunit/phpunit-mock-objects (5.0.10)
• Removing symfony/polyfill-ctype (v1.19.0)
• Removing webmozart/assert (1.9.1)
• Upgrading doctrine/instantiator (1.0.5 => 1.5.0)
• Upgrading myclabs/deep-copy (1.7.0 => 1.11.1)
• Upgrading phar-io/manifest (1.0.1 => 2.0.3)
• Upgrading phar-io/version (1.0.1 => 3.2.1)
• Upgrading phpunit/php-code-coverage (dev-mantis-5.3 7642884 => 7.0.15)
• Upgrading phpunit/php-file-iterator (dev-mantis-1.4 89be108 => 2.0.5)
• Upgrading phpunit/php-timer (1.0.9 => 2.1.3)
• Upgrading phpunit/php-token-stream (2.0.2 => 3.1.3)
• Upgrading phpunit/phpunit (dev-mantis-6.5 215feef => 8.5.33)
• Upgrading sebastian/comparator (2.1.3 => 3.0.5)
• Upgrading sebastian/diff (2.0.1 => 3.0.4)
• Upgrading sebastian/environment (3.1.0 => 4.2.4)
• Upgrading sebastian/exporter (3.1.4 => 3.1.5)
• Upgrading sebastian/global-state (2.0.0 => 3.0.3)
• Upgrading sebastian/resource-operations (1.0.0 => 2.0.2)
• Locking sebastian/type (1.1.4)
• Upgrading theseer/tokenizer (1.1.3 => 1.2.1)