Bump gecko-packages/gecko-php-unit from 3.0 to 3.1.1

[dependabot-preview[bot]]

Bumps gecko-packages/gecko-php-unit from 3.0 to 3.1.1.

Release notes

*Sourced from [gecko-packages/gecko-php-unit's releases](https://github.com/GeckoPackages/GeckoPHPUnit/releases).* > ## v3.1.1 > Add PHPUnit 7 as conflict. > > ## v3.1 > - added missing conflict with some version(s) of PHPUnit

Changelog

*Sourced from [gecko-packages/gecko-php-unit's changelog](https://github.com/GeckoPackages/GeckoPHPUnit/blob/3.0/CHANGELOG.md).* > #### GeckoPackages > > # CHANGELOG for PHPUnit extensions > > This file contains the changelogs of the package. > > ### Changelog for v3.1 > ###### Jan 24, 2018 > > - add missing conflict with PHPUnit in composer.json

Commits

- [`8b03201`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/8b0320158e34c3d85e5133c341d55c4d6ec5e927) Merge pull request [#56](https://github-redirect.dependabot.com/GeckoPackages/GeckoPHPUnit/issues/56) from Slamdunk/patch-1 - [`b5b8d16`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/b5b8d16b18c02113e20e6f20e4736a91bc58ced2) Add PHPUnit 7.0 conflict - [`dbb18b2`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/dbb18b292cfa14444d2e6d15202b9dcf5ab8365e) Update CHANGELOG.md - [`83550fa`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/83550fa3a82eba027564b7145a22291be4695eb2) Merge pull request [#52](https://github-redirect.dependabot.com/GeckoPackages/GeckoPHPUnit/issues/52) from SpacePossum/master_conflicts - [`4e682b1`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/4e682b1cba4a56db6e940205dcd30c1ba73b048f) composer.json - add missing conflict with PHPUnit below 6 - [`19fa0f0`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/19fa0f049d1634d54e63c0fcfaaf8784ab123bb8) Merge pull request [#53](https://github-redirect.dependabot.com/GeckoPackages/GeckoPHPUnit/issues/53) from SpacePossum/3_0_CS_updates - [`174f6fc`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/174f6fc092a40e9c1cf8dda12a92a7da924464ac) Travis - add PHP 7.2, stop testing on HHVM, echo $TRAVIS_PHP_VERSION, reenabl... - [`e640fd5`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/e640fd5bfc94e9de9f63734ad213f631aa6a97a0) CS - update - [`24742c7`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/24742c703e376cf89d1686aa1b7a27c79809605b) Update UPGRADE.md - [`33d6410`](https://github.com/GeckoPackages/GeckoPHPUnit/commit/33d6410c27e7a18ba65dcb79fbd25ee68942e85b) Update UPGRADE.md - See full diff in [compare view](https://github.com/GeckoPackages/GeckoPHPUnit/compare/v3.0...v3.1.1)

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[dependabot-preview[bot]]

Looks like gecko-packages/gecko-php-unit is no longer a dependency, so this is no longer needed.