Update phpunit/phpunit requirement from ^5.7 || ^7.5 to ^8.2.2

[dependabot-preview[bot]]

Updates the requirements on phpunit/phpunit to permit the latest version.

Changelog

*Sourced from [phpunit/phpunit's changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-8.2.md).* > ## [8.2.2] - 2019-06-15 > > ### Changed > > * Scoped PHAR built with newer version of PHP-Scoper > > ## [8.2.1] - 2019-06-07 > > ### Fixed > > * Fixed [type#2](https://github-redirect.dependabot.com/sebastianbergmann/type/issues/2): Stubbing of methods with `callable` or `iterable` return type does not work > > ## [8.2.0] - 2019-06-07 > > ### Added > > * Implemented [#3506](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3506): PHP options should be passed to child processes > * Implemented [#3586](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3586): Show time spent on code coverage report generation > * Implemented [#3682](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3682): Allow using `duration` for the `--order-by` option as well as for the `executionOrder` attribute in `phpunit.xml` > > ### Changed > > * Implemented [#3122](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3122): Prevent runtime type error due to wrong return value configuration of test double > * Implemented [#3708](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/pull/3708): Built-in assertion and mock type definitions > > ### Fixed > > * Fixed [#3602](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/3602): PHPUnit silently ignores the return value on a `void` method of test double > > [8.2.3]: https://github.com/sebastianbergmann/phpunit/compare/8.2.2...8.2.3 > [8.2.2]: https://github.com/sebastianbergmann/phpunit/compare/8.2.1...8.2.2 > [8.2.1]: https://github.com/sebastianbergmann/phpunit/compare/8.2.0...8.2.1 > [8.2.0]: https://github.com/sebastianbergmann/phpunit/compare/8.1.6...8.2.0

Commits

- See full diff in [compare view](https://github.com/sebastianbergmann/phpunit/commits/8.2.2)

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[dependabot-preview[bot]]

Superseded by #201.