Bump capybara-screenshot from 1.0.18 to 1.0.21

[dependabot-preview]

Bumps capybara-screenshot from 1.0.18 to 1.0.21.

Changelog

Sourced from capybara-screenshot's changelog.

03 May 2018 - 1.0.20 -> 1.0.21

• Bug fix: Fix Ruby version compares in Gemspec

03 May 2018 - 1.0.19 -> 1.0.20

• Bug fix: Only take screenshots for feature tests

10 April 2018 - 1.0.18 -> 1.0.19

• Big thanks for Geremia Taglialatela for padding Capybara 3 support and fixing the builds

2 November 2017 - 1.0.17 -> 1.0.18

• RSpec 3.3 support
• Add support for selenium_chrome and selenium_chrome_headless
• Less dependencies for S3 uploads

Special thanks to the fine contribution from Matt Bricston

17 July 2017 - 1.0.16 -> 1.0.17

• Better handling of page.current_path exceptions for Spinach

12 July 2017 - 1.0.15 -> 1.0.16

• Support s3 key name prefixes

12 July 2017 - 1.0.14 -> 1.0.15

• SVG badges added
• Ensure the reporter module is not loaded multiple times
• S3 object config option
• Saver can use injected page
• After* callbacks

15 Sep 2016 - 1.0.13 -> 1.0.14

• CI stable again - dropped CI support for older versions of Ruby and JRuby. It is just too painful and there is no evidence that our users need this or that Capybara Screenshot is indeed broken. It is better to have a reliable build system so that PRs can get merged in reliably and easily.
• Fixed an inconsistency in the use of save_and_open_page_path
• Improved debugging of Aruba tests so that contributors can easily understand why their builds break
• Path fixes thanks to Ryan McGarvey

23 May 2016 - 1.0.12 -> 1.0.13

• Fixes mkmf bug 162 and mkmf bug 174
• Fix for Capybara.save_path method existence assumption

29 March 2016 - 1.0.11 -> 1.0.12

... (truncated)

Commits

• 33bd951 Version bump
• c0f888f Fix ruby version compares
• 3d16e1d Version bump
• 0b75295 Only take screenshots for features tests
• e77fc60 Version bump - Capybara 3 support
• a6e4985 Test against latest Ruby versions
• b6c9c60 Add Capybara 3 compatibility
• 552bee8 Fix deprecation
• 502b539 Fix failing specs
• 8e36927 Added to README
• Additional commits viewable in compare view

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