Bump behat/mink from 1.7.1 to 1.8.1

[dependabot-preview]

Bumps behat/mink from 1.7.1 to 1.8.1.

Changelog

Sourced from behat/mink's changelog.

1.8.1 / 2020-03-11

Bug fixes:

• Fixed the phpdoc of NodeElement::getValue. This method actually returns null in some cases (unchecked checkbox for instance)

1.8.0 / 2020-03-11

New features:

• Auto-start the session on first call to visit. Mink::getSession() will no longer start the session automatically.
• Added support for symfony/css-selector 4 and 5

Bug fixes:

• Fixed the message when reporting the deprecation of ExpectationException::getSession()
• Fixed support for XPath selectors using | inside strings or conditions rather than as a top-level union
• Fixed compatibility with PHP 7.2 not allowing to use count on strings

Testsuite:

• Added PHP 7.1, 7.2, 7.3 and 7.4 in the CI
• Removed HHVM from CI as they stopped supporting PHP compatibility

Driver testsuite:

• The driver testsuite is no longer part of this package. Use mink/driver-testsuite to run driver tests instead.

Misc:

• Changed phpdoc types from Boolean to boolean to be compatible with psalm type checking

Commits

• 07c6a9f Update the changelog
• 24b542f Merge pull request #793 from Lctrs/patch-1
• e1772aa Update the branch alias for master
• a77f3cd Update changelog
• 394b324 Merge pull request #795 from tongvanduc/patch-1
• 316fdd8 Update composer.json
• ccef198 Merge pull request #797 from stof/ci_phpunit
• 2af2ada Add the Symfony debug component to report all deprecations
• f19d1a3 Install PHPUnit through composer
• b2e031b Php73 74 (#792)
• Additional commits viewable in compare view

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