Upgrade capybara to version 3.21.0

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ capybara (~> 2.17 → ~> 3.21) · Repo · Changelog

Release Notes

3.21.0 (from changelog)

Release date: 2019-05-24

Added

• Element#drop - Chrome and Firefox, via the selenium driver, support dropping files/data on elements
• Default CSS used for attach_file make_visible: true now includes auto for height and width to handle more ways of hiding the file input element
• Documentation Updates and Fixes - Many thanks to Masafumi Koba! [Masafumi Koba]

Changed

• Deprecate support for CSS locator being a Symbol

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by more commits than we can show here.

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[depfu]

Closed in favor of #55.