Bump phpunit/phpunit from 4.7.2 to 4.8.36

[dependabot[bot]]

Bumps phpunit/phpunit from 4.7.2 to 4.8.36.

Commits

• 46023de Expand forward compatibility layer
• 912b8c1 Link to https://phpunit.de/build-status.html
• 791b1a6 Prepare release
• a55235c Backport forward compatibility layer for PHPUnit 6 from PHPUnit 5
• 95f30cd Update Composer to 1.3.2
• 7eb4520 Prepare release
• 05da557 Closes #2447
• 6381a99 Prepare release
• d13b2f6 Closes #2392
• ced3792 Make these tests compatible with PHPUnit 4.8
• Additional commits viewable in compare view

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