Package updates
Package updates

 - guzzlehttp/guzzle updated from 6.2.1 to 6.2.2
   See changes: https://github.com/guzzle/guzzle/compare/6.2.1...6.2.2
   Release notes: https://github.com/guzzle/guzzle/releases/tag/6.2.2

 - symfony/yaml updated from v3.1.3 to v3.1.5
   See changes: https://github.com/symfony/yaml/compare/v3.1.3...v3.1.5
   Release notes: https://github.com/symfony/yaml/releases/tag/v3.1.5

 - phpunit/phpunit-mock-objects updated from 3.2.4 to 3.4.0
   See changes: https://github.com/sebastianbergmann/phpunit-mock-objects/compare/3.2.4...3.4.0
   Release notes: https://github.com/sebastianbergmann/phpunit-mock-objects/releases/tag/3.4.0

 - phpdocumentor/reflection-docblock updated from 3.1.0 to 3.1.1
   See changes: https://github.com/phpDocumentor/ReflectionDocBlock/compare/3.1.0...3.1.1
   Release notes: https://github.com/phpDocumentor/ReflectionDocBlock/releases/tag/3.1.1

 - myclabs/deep-copy updated from 1.5.1 to 1.5.4
   See changes: https://github.com/myclabs/DeepCopy/compare/1.5.1...1.5.4
   Release notes: https://github.com/myclabs/DeepCopy/releases/tag/1.5.4

 - phpunit/phpunit updated from 5.5.2 to 5.6.1
   See changes: https://github.com/sebastianbergmann/phpunit/compare/5.5.2...5.6.1
   Release notes: https://github.com/sebastianbergmann/phpunit/releases/tag/5.6.1

 - vlucas/phpdotenv updated from v2.3.0 to v2.4.0
   See changes: https://github.com/vlucas/phpdotenv/compare/v2.3.0...v2.4.0
   Release notes: https://github.com/vlucas/phpdotenv/releases/tag/v2.4.0

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