Update phpunit/phpunit from 5.7.21 to 5.7.24

[violinist-bot]

If you have a decent test suite, and your tests pass, it should be both safe and smart to merge this update.

Here is a list of changes between the version you use, and the version this pull request updates to:

• f0b07fb Prepare release
• 4683365 Update ChangeLog
• 4730e9f Changing method-local, static variable to private, dynamic
• 096049b Fix for declaring test case in data provider
• 7e8e262 Test for data provider declaring class
• 58cdc63 Add required attrib in config generator template
• 86a6a76 Allow symfony/yaml:4.0
• 4f426b3 Fix
• ab4cdd8 Add test for #2811
• 78532d5 Prepare release
• 182941e TestCase->setExpectedException - properly handle lack of message
• ae3fcc0 Add test for #2731
• ae47d61 Update ChangeLog
• 567ca23 Backport fix for #2731 from PHPUnit 6.4 to PHPUnit 5.7
• 905862c Fix: Wording
• 78dcaf0 Travis - add libxml2-utils for xmllint
• 10df877 Prepare release
• c29b33b Update tools
• 4eba337 Closes #2769
• 3bfbdd9 Add test case for #2758
• 011cc0e master is 7.3 now so lets build with 7.2 and 7.2snapshot, too
• 552d65f Update tools
• 40db23c Update tools
• a12edbc Move configuration for preference of stable packages to composer.json
• 2dd0ac5 We also need --prefer-stable with --prefer-lowest
• 84349f1 rbenv: version `5.6snapshot' not installed
• d8b3fa3 Also test with 5.6snapshot, 7.0snapshot, and 7.1snapshot
• 67606db Eliminate code duplication
• e4f6d3c Reorder
• acb7c16 Move configuration of autoloader optimization from build.xml to composer.json
• a3d871e Enable package sorting
• 9e245fb Fix
• a48119f Fixed annotation - multiple interfaces can be used.
• c0c61c9 Merge branch '4.8' into 5.7
• 18e5f52 Fix URL

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This is an automated pull request from Violinist: Continuously and automatically monitor and update your composer dependencies. Have ideas on how to improve this message? All violinist messages are open-source, and can be improved here.

[coveralls]

Coverage remained the same at 100.0% when pulling f5ecafb on violinist-dev:phpunitphpunit57215724 into 2d2a567 on eiriksm:master.