Bump sitemap_generator from 5.3.1 to 6.0.1

[dependabot-preview]

Bumps sitemap_generator from 5.3.1 to 6.0.1.

Changelog

Sourced from sitemap_generator's changelog.

6.0.1

• Use yaml_tag instead of yaml_as, which was deprecated in Ruby 2.4, and removed in 2.5 #298.

6.0.0

Backwards incompatible changes

• Adapters (AWS SDK, S3, Fog & Wave) no longer load their dependencies. It is up to the user
  to require the appropriate libraries for the adapter to work.
• AwsSdkAdapter: Fixed #279 where sitemaps were incorrectly nested under a sitemaps/ directory in S3
• Stop supporting Ruby < 2.0, test with Ruby 2.4.

Other changes

• If Rails is defined but the application is not loaded, don't include the URL helpers.

Commits

• 0007e3b Upgrade to v6.0.1
• 175ea4b Merge pull request #298 from mattbrictson/replace-yaml_as-with-yaml_tag
• 5b6e915 yaml_as is deprecated in Ruby 2.4, removed in 2.5
• a6edcf5 Update README table of contents
• 4f8ba4c Add task to ensure that all files are world readable before building the pack...
• 9dee6f5 Upgrade to version 6.0.0
• 640a733 Remove 'fog-awe' from the Gemfile because it's in the gemspec
• 99d89d2 Update remote host example docs
• d29b992 Update license
• 6cbdbdc Update table of contents
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 66.612% when pulling 9c7bb02 on dependabot/bundler/sitemap_generator-6.0.1 into 7f74f34 on develop.

[dependabot-preview]

Superseded by #609.