Update capybara requirement from ~> 2.4 to ~> 3.15

[dependabot-preview[bot]]

Updates the requirements on capybara to permit the latest version.

Changelog

*Sourced from [capybara's changelog](https://github.com/teamcapybara/capybara/blob/master/History.md).* > # Version 3.15 > Release date: 2019-03-19 > > ### Added > > * `attach_file` now supports a block mode on JS capable drivers to more accurately test user behavior when file inputs are hidden (beta) > * :table selector now supports `with_rows`, 'rows', `with_cols`, and 'cols' filters > > ### Fixed > > * Fix link selector when `Capybara.test_id` is set - Issue [#2166](https://github-redirect.dependabot.com/teamcapybara/capybara/issues/2166) [bingjyang] > > > # Version 3.14 > Release date: 2019-02-25 > > ### Added > > * rack_test driver now supports reloading elements when the document changes - Issue [#2157](https://github-redirect.dependabot.com/teamcapybara/capybara/issues/2157) > * Selenium driver HTML5 drag-drop emulation now emits multiple move events so drag direction > is determinable [Erkki Eilonen, Thomas Walpole] > * Capybara.server_errors now defaults to [Exception] - Issue [#2160](https://github-redirect.dependabot.com/teamcapybara/capybara/issues/2160) [Edgars Beigarts] > ### Fixed > > * Workaround hover issue with FF 65 - Issue [#2156](https://github-redirect.dependabot.com/teamcapybara/capybara/issues/2156) > * Workaround chromedriver issue when setting blank strings to react controlled text fields > * Workaround chromedriver issue with popup windows not loading content - https://bugs.chromium.org/p/chromedriver/issues/detail?id=2650&q=load&sort=-id&colspec=ID%20Status%20Pri%20Owner%20Summary > > # Version 3.13.2 > Release date: 2019-01-24 > > ### Fixed > > * Remove extraneous output > > # Version 3.13.1 > Release date: 2019-01-24 > > ### Fixed > > * Only use Selenium visibility optimization when JS atom is available - Issue [#2151](https://github-redirect.dependabot.com/teamcapybara/capybara/issues/2151) > > # Version 3.13.0 > Release date: 2019-01-23 > > ### Added > > * Session#quit added > * #scroll_to added to allow scrolling page/elements to specified locations > * Speed optimizations around multiple element location and path generation when using the Selenium driver > ... (truncated)

Commits

- [`bdee68d`](https://github.com/teamcapybara/capybara/commit/bdee68d0cbaaa2770c489cfd95966964e77e8ba7) Update README.md [ci skip] - [`5bc3f44`](https://github.com/teamcapybara/capybara/commit/5bc3f445aed4e0277b7eb0cb19251fbbf5d3eb36) Prepare for 3.15 release - [`5146c4a`](https://github.com/teamcapybara/capybara/commit/5146c4aa1f7bd95a0520582aa34ecf55243ea313) Implement :cols option for :table selector and add documentation - [`2f2b149`](https://github.com/teamcapybara/capybara/commit/2f2b14997f0cfe727f6ecda186c7bb5ce65040dc) Merge pull request [#2168](https://github-redirect.dependabot.com/teamcapybara/capybara/issues/2168) from teamcapybara/table - [`5504121`](https://github.com/teamcapybara/capybara/commit/5504121f5df8cdd7e2f80677909057b8a431b187) Add require all :rows expression filter - [`8fdb380`](https://github.com/teamcapybara/capybara/commit/8fdb3801331dcecc29f0276040ce730de55535bb) Update History and fix with_cols when no vertical table headers - [`94beb19`](https://github.com/teamcapybara/capybara/commit/94beb19baa9b342ed5fc8a4a879559422a777413) Support table column as array of ordered required values - [`b802c87`](https://github.com/teamcapybara/capybara/commit/b802c87d8a29a7d31c5cd31b894334b00a09746f) Add table selector with_cols and with_rows expression filters - [`18c9325`](https://github.com/teamcapybara/capybara/commit/18c9325fd2f36cb3cc1499d1ac43d5c98b704d83) Make table_row array matching order dependant - [`7d559ee`](https://github.com/teamcapybara/capybara/commit/7d559ee35b1d91bbea594d56e981330792ed4ca7) Add table_row selector type - Additional commits viewable in [compare view](https://github.com/teamcapybara/capybara/compare/2.4.0...3.15.0)

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Superseded by #77.