Bump sitemap_generator from 5.3.1 to 6.0.2

[dependabot-preview]

Bumps sitemap_generator from 5.3.1 to 6.0.2.

Changelog

Sourced from sitemap_generator's changelog.

6.0.2

• Resolve BigDecimal.new is deprecated warnings in Ruby 2.5 #305.
• Resolve instance variable not initialized, File.exists? is deprecated and '*' interpreted as argument prefix warnings #304.

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

• 92c612c Upgrade to v6.0.2
• aab1c3c Use Ruby 2.5.1 for development
• 5414443 Merge branch 'warnings' of https://github.com/amatsuda/sitemap_generator
• 87d2b71 Merge pull request #305 from amatsuda/bigdecimal
• b1f80f3 Merge pull request #310 from TomK32/patch-1
• d6a810a Fix rails instructions in README
• 0b847f1 Merge pull request #307 from 3b7/readme-update
• 2eab9f9 Fix anchor link in Readme
• 2698ea2 Prefer composition over inheritance with BigDecimal
• 6b919aa ⚠️ instance variable @​default_host, @​sitemaps_host, @​yield_sitemap, @​s...
• Additional commits viewable in compare view

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