Update phpunit/phpunit requirement to ^7.1.1

[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-5.7.md).* > # Changes in PHPUnit 5.7 > > All notable changes of the PHPUnit 5.7 release series are documented in this file using the [Keep a CHANGELOG](http://keepachangelog.com/) principles. > > ## [5.7.27] - 2018-02-01 > > ### Fixed > > * Fixed [#2236](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2236): Exceptions in `tearDown()` do not affect `getStatus()` > * Fixed [#2950](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2950): Class extending `PHPUnit\Framework\TestSuite` does not extend `PHPUnit\FrameworkTestCase` > * Fixed [#2972](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2972): PHPUnit crashes when test suite contains both `.phpt` files and unconventionally named tests > > ## [5.7.26] - 2017-12-17 > > ### Fixed > > * Fixed [#2472](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2472): `PHPUnit\Util\Getopt` uses deprecated `each()` function > * Fixed [#2833](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2833): Test class loaded during data provider execution is not discovered > * Fixed [#2922](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2922): Test class is not discovered when there is a test class with `[**group**](https://github.com/group)` and provider throwing exception in it, tests are run with `--exclude-group` for that group, there is another class called later (after the class from above), and the name of that another class does not match its filename > > ## [5.7.25] - 2017-11-14 > > ### Fixed > > * Fixed [#2859](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2859): Regression caused by fix for [#2833](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2833) > > ## [5.7.24] - 2017-11-14 > > ### Fixed > > * Fixed [#2833](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2833): Test class loaded during data provider execution is not discovered > > ## [5.7.23] - 2017-10-15 > > ### Fixed > > * Fixed [#2731](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2731): Empty exception message cannot be expected > > ## [5.7.22] - 2017-09-24 > > ### Fixed > > * Fixed [#2769](https://github-redirect.dependabot.com/sebastianbergmann/phpunit/issues/2769): Usage of `setUseErrorHandler()` produces `Undefined variable` error > > ## [5.7.21] - 2017-06-21 > > ### Added > > * Added `PHPUnit\Framework\AssertionFailedError`, `PHPUnit\Framework\Test`, and `PHPUnit\Framework\TestSuite` to the forward compatibility layer for PHPUnit 6 > > ... (truncated)

Commits

- See full diff in [compare view](https://github.com/sebastianbergmann/phpunit/commits/7.1.1)

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[alcohol]

@dependabot ignore this dependency

[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.

[dependabot-preview[bot]]

OK, I won't notify you about phpunit/phpunit again, unless you re-open this PR or update it yourself. 😢