update php dependencies
update php dependencies

Changelogs summary:

 - onelogin/php-saml updated from 2.11.0 to v2.12.0
   See changes: https://github.com/onelogin/php-saml/compare/2.11.0...v2.12.0
   Release notes: https://github.com/onelogin/php-saml/releases/tag/v2.12.0

 - symfony/polyfill-mbstring updated from v1.5.0 to v1.6.0
   See changes: https://github.com/symfony/polyfill-mbstring/compare/v1.5.0...v1.6.0
   Release notes: https://github.com/symfony/polyfill-mbstring/releases/tag/v1.6.0

 - symfony/http-foundation updated from v3.3.9 to v3.3.13
   See changes: https://github.com/symfony/http-foundation/compare/v3.3.9...v3.3.13
   Release notes: https://github.com/symfony/http-foundation/releases/tag/v3.3.13

 - symfony/finder updated from v2.8.27 to v2.8.31
   See changes: https://github.com/symfony/finder/compare/v2.8.27...v2.8.31
   Release notes: https://github.com/symfony/finder/releases/tag/v2.8.31

 - erusev/parsedown updated from 1.6.3 to 1.6.4
   See changes: https://github.com/erusev/parsedown/compare/1.6.3...1.6.4
   Release notes: https://github.com/erusev/parsedown/releases/tag/1.6.4

 - jms/serializer updated from 1.9.0 to 1.9.2
   See changes: https://github.com/schmittjoh/serializer/compare/1.9.0...1.9.2
   Release notes: https://github.com/schmittjoh/serializer/releases/tag/1.9.2

 - symfony/config updated from v2.8.27 to v2.8.31
   See changes: https://github.com/symfony/config/compare/v2.8.27...v2.8.31
   Release notes: https://github.com/symfony/config/releases/tag/v2.8.31

 - symfony/console updated from v2.8.27 to v2.8.31
   See changes: https://github.com/symfony/console/compare/v2.8.27...v2.8.31
   Release notes: https://github.com/symfony/console/releases/tag/v2.8.31

 - symfony/event-dispatcher updated from v2.8.27 to v2.8.31
   See changes: https://github.com/symfony/event-dispatcher/compare/v2.8.27...v2.8.31
   Release notes: https://github.com/symfony/event-dispatcher/releases/tag/v2.8.31

 - symfony/stopwatch updated from v2.8.27 to v2.8.31
   See changes: https://github.com/symfony/stopwatch/compare/v2.8.27...v2.8.31
   Release notes: https://github.com/symfony/stopwatch/releases/tag/v2.8.31

 - symfony/validator updated from v2.8.27 to v2.8.31
   See changes: https://github.com/symfony/validator/compare/v2.8.27...v2.8.31
   Release notes: https://github.com/symfony/validator/releases/tag/v2.8.31

 - zendframework/zend-serializer updated from 2.8.0 to 2.8.1
   See changes: https://github.com/zendframework/zend-serializer/compare/2.8.0...2.8.1
   Release notes: https://github.com/zendframework/zend-serializer/releases/tag/2.8.1

 - zendframework/zend-servicemanager updated from 2.7.8 to 2.7.9
   See changes: https://github.com/zendframework/zend-servicemanager/compare/2.7.8...2.7.9
   Release notes: https://github.com/zendframework/zend-servicemanager/releases/tag/2.7.9

 - symfony/process updated from v2.8.27 to v2.8.31
   See changes: https://github.com/symfony/process/compare/v2.8.27...v2.8.31
   Release notes: https://github.com/symfony/process/releases/tag/v2.8.31

 - facebook/webdriver updated from 1.4.1 to 1.5.0
   See changes: https://github.com/facebook/php-webdriver/compare/1.4.1...1.5.0
   Release notes: https://github.com/facebook/php-webdriver/releases/tag/1.5.0

 - sebastian/comparator updated from 2.0.2 to 2.1.0
   See changes: https://github.com/sebastianbergmann/comparator/compare/2.0.2...2.1.0
   Release notes: https://github.com/sebastianbergmann/comparator/releases/tag/2.1.0

 - phpunit/php-file-iterator updated from 1.4.2 to 1.4.5
   See changes: https://github.com/sebastianbergmann/php-file-iterator/compare/1.4.2...1.4.5
   Release notes: https://github.com/sebastianbergmann/php-file-iterator/releases/tag/1.4.5

 - phpunit/php-token-stream updated from 2.0.1 to 2.0.2
   See changes: https://github.com/sebastianbergmann/php-token-stream/compare/2.0.1...2.0.2
   Release notes: https://github.com/sebastianbergmann/php-token-stream/releases/tag/2.0.2

 - phpunit/php-code-coverage updated from 5.2.2 to 5.2.4
   See changes: https://github.com/sebastianbergmann/php-code-coverage/compare/5.2.2...5.2.4
   Release notes: https://github.com/sebastianbergmann/php-code-coverage/releases/tag/5.2.4

 - phpspec/prophecy updated from v1.7.2 to 1.7.3
   See changes: https://github.com/phpspec/prophecy/compare/v1.7.2...1.7.3
   Release notes: https://github.com/phpspec/prophecy/releases/tag/1.7.3

 - myclabs/deep-copy updated from 1.6.1 to 1.7.0
   See changes: https://github.com/myclabs/DeepCopy/compare/1.6.1...1.7.0
   Release notes: https://github.com/myclabs/DeepCopy/releases/tag/1.7.0

 - phpunit/phpunit updated from 6.3.1 to 6.4.4
   See changes: https://github.com/sebastianbergmann/phpunit/compare/6.3.1...6.4.4
   Release notes: https://github.com/sebastianbergmann/phpunit/releases/tag/6.4.4

 - symfony/dom-crawler updated from v3.3.9 to v3.3.13
   See changes: https://github.com/symfony/dom-crawler/compare/v3.3.9...v3.3.13
   Release notes: https://github.com/symfony/dom-crawler/releases/tag/v3.3.13

 - symfony/browser-kit updated from v3.3.9 to v3.3.13
   See changes: https://github.com/symfony/browser-kit/compare/v3.3.9...v3.3.13
   Release notes: https://github.com/symfony/browser-kit/releases/tag/v3.3.13

 - symfony/css-selector updated from v3.3.9 to v3.3.13
   See changes: https://github.com/symfony/css-selector/compare/v3.3.9...v3.3.13
   Release notes: https://github.com/symfony/css-selector/releases/tag/v3.3.13

 - symfony/yaml updated from v3.3.9 to v3.3.13
   See changes: https://github.com/symfony/yaml/compare/v3.3.9...v3.3.13
   Release notes: https://github.com/symfony/yaml/releases/tag/v3.3.13

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