Update dependency phpunit/phpunit to v6.5.14

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
phpunit/phpunit	require-dev	minor	6.0 -> 6.5.14	homepage, source

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Release Notes

sebastianbergmann/phpunit

v6.5.14

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v6.5.13

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v6.5.12

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v6.5.11

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v6.5.10

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v6.5.9

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v6.5.8

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v6.5.7

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v6.5.6

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v6.5.5

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v6.5.4

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v6.5.3

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v6.5.2

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v6.5.1

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v6.5.0

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v6.4.4

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v6.4.3

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v6.4.2

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v6.4.1

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v6.4.0

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v6.3.1

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v6.3.0

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v6.2.4

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v6.2.3

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v6.2.2

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v6.2.1

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v6.2.0

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v6.1.4

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v6.1.3

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v6.1.2

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v6.1.1

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v6.1.0

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v6.0.13

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v6.0.12

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v6.0.11

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v6.0.10

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v6.0.9

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v6.0.8

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v6.0.7

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v6.0.6

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v6.0.5

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v6.0.4

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v6.0.3

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v6.0.2

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⚠️ Lock file problem

Renovate failed to update a lock file. You probably do not want to merge this PR as-is.

♻️ Renovate will retry this branch, including lockfile, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The lock file failure details are included below:

composer.lock

Command failed: docker run --rm -v /mnt/renovate/gh/poetapp/wordpress-plugin:/mnt/renovate/gh/poetapp/wordpress-plugin -v /mnt/renovate/tmp/renovate/cache/composer:/mnt/renovate/tmp/renovate/cache/composer -e COMPOSER_CACHE_DIR -w /mnt/renovate/gh/poetapp/wordpress-plugin renovate/composer composer update phpunit/phpunit --ignore-platform-reqs --no-ansi --no-interaction --no-scripts --no-autoloader
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Can only install one of: sebastian/global-state[2.0.0, 1.1.1].
    - Can only install one of: sebastian/global-state[2.0.0, 1.1.1].
    - phpunit/phpunit 6.5.14 requires sebastian/global-state ^2.0 -> satisfiable by sebastian/global-state[2.0.0].
    - Installation request for phpunit/phpunit 6.5.14 -> satisfiable by phpunit/phpunit[6.5.14].
    - Installation request for sebastian/global-state (locked at 1.1.1) -> satisfiable by sebastian/global-state[1.1.1].

 `docker run --rm -v /mnt/renovate/gh/poetapp/wordpress-plugin:/mnt/renovate/gh/poetapp/wordpress-plugin -v /mnt/renovate/tmp/renovate/cache/composer:/mnt/renovate/tmp/renovate/cache/composer -e COMPOSER_CACHE_DIR -w /mnt/renovate/gh/poetapp/wordpress-plugin renovate/composer composer update phpunit/phpunit --ignore-platform-reqs --no-ansi --no-interaction --no-scripts --no-autoloader` (exited with error code 2)