Update phpunit/phpunit requirement from ^5.2 to ^5.2 || ^6.0

[dependabot-preview]

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

Changelog

Sourced from phpunit/phpunit's changelog.

[6.5.14] - 2019-02-01

Fixed

• Fixed #3459: @requires function swallows digits at the end of function name

[6.5.13] - 2018-09-08

Fixed

• Fixed #3181: --filter should be case-insensitive
• Fixed #3234: assertArraySubset() with $strict=true does not display differences properly
• Fixed #3254: TextUI test runner cannot run a Test instance that is not a TestSuite

[6.5.12] - 2018-08-22

Fixed

• Fixed #3248 and #3233: phpunit.xsd dictates element order where it should not
• Fixed #3251: TeamCity result logger is missing test duration information

[6.5.11] - 2018-08-07

Fixed

• Fixed #3219: getMockFromWsdl() generates invalid PHP code when WSDL filename contains special characters

[6.5.10] - 2018-08-03

Fixed

• Fixed #3209: Test::run() and TestCase::run() interface contradiction
• Fixed #3218: prefix attribute for directory node missing from phpunit.xml XSD
• Fixed #3225: coverage-php missing from phpunit.xsd

[6.5.9] - 2018-07-03

Fixed

• Fixed #3142: Method-level annotations (@backupGlobals, @backupStaticAttributes, @errorHandler, @preserveGlobalState) do not override class-level annotations

[6.5.8] - 2018-04-10

Fixed

• Fixed #2830: @runClassInSeparateProcess does not work for tests that use @dataProvider

[6.5.7] - 2018-02-26

Fixed

... (truncated)

Commits

• bac23fe Prepare release
• fe7da90 Update tools
• 01a3008 Update tools
• 27ecf67 Only test PHPUnit 6.5 on PHP versions it is supported on
• 706c004 Update
• 575fd4a Update ChangeLog
• 17a8efe Backport of fix for #3459 to PHPUnit 6.5.x
• 6050504 Bump copyright year
• a33f8d2 Update php-cs-fixer
• eb22621 Revert "Do not use Phive to manage php-cs-fixer (for now)"
• Additional commits viewable in compare view

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