Bump poltergeist from 1.15.0 to 1.18.1

[dependabot-preview]

Bumps poltergeist from 1.15.0 to 1.18.1.

Changelog

Sourced from poltergeist's changelog.

1.18.1

Bug Fixes

• Fixed #current_url should return correct url when on 'about:blank' (Thomas Walpole)[Issue #927]

1.18.0

Features

• User agent and other headers persist across windows (Tony Novak)[Issue #915]
• Capybara 3 support (Thomas Walpole)
• Support configuring PhantomJS page setting when initializing driver (Thomas Walpole)
• Support for mouse click with offset and button presses (Thomas Walpole)

Bug Fixes

• Fixed page source potentially blank based on page load timing (Thomas Walpole)

1.17.0

Features

• Support Capybara Session#evaluate_async_script (Thomas Walpole)

Bug Fixes

• Fixed system modals in a second window (Shunichi Ikegami)
• Fixed hang due to stdin input being processed by Poltergeist::Client (Fumiaki Matsushima)

1.16.0

Features

• Support Capybara Session#refresh (Thomas Walpole)

Bug Fixes

• Fixed key alias spelling for "multiply"
• Fix hangs while waiting for PhantomJS to die (Thomas Walpole)[Issue #747]

Commits

• 1254f34 Prepare for 1.18.1 release
• dd96a31 Merge pull request #928 from teampoltergeist/about_blank
• 825909f current_url should be about:blank when on about:blank - Fix Issue # 927
• d3e0d8b Prepare for 1.18.0 release
• e555ccd Merge pull request #925 from teampoltergeist/datalist_tests
• c9b34bc Merge pull request #924 from teampoltergeist/page_settings
• 8cb7210 Skip datalist tests because PJS doesn't support datalist
• 1d07fa4 Support overriding the PJS page settings when initializing driver - http://ph...
• 895c90e Merge pull request #916 from afn/master
• c0f6660 Merge pull request #923 from teampoltergeist/travis_defaults_pjs_211
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 66.655% when pulling 7f62140 on dependabot/bundler/poltergeist-1.18.1 into e1c0625 on develop.