Update ex_doc requirement from ~> 0.25.2 to ~> 0.26.0

[dependabot]

Updates the requirements on ex_doc to permit the latest version.

Changelog

Sourced from ex_doc's changelog.

v0.26.0 (2021-11-21)

• Backwards incompatible changes

  • :filter_prefix has been renamed to :filter_modules and supports anonymous functions
  • :source_ref now defaults to "main"
  • Dropped support for smartypants in Markdown

• Bug fixes

  • Do not warn on links to sections

• Enhancements

  • Add copy button to code snippets
  • Add translate="no" to the relevant attributes to improve interoperability with automatic translation tools
  • Support optional module annotations
  • Introduce a settings modal to group most of configuration
  • Allow customizing the Livebook expansion URL
  • Provide documentation on how to render plugins such as Katex, VegaLite, and Mermaid

v0.25.5 (2021-10-20)

• Bug fixes
  • Do not duplicate API Reference title
  • Update assets for Livebook badge functionality

v0.25.4 (2021-10-20)

• Enhancements

  • Add source link to pages in :extras
  • Add "Run in Livebook" badge to .livemd pages in :extras

• Bug fixes

  • Do not generate entries for private Erlang functions
  • Do not trim ? and ! from Elixir tokens on search

• Incompatible changes

  • Remove unused :source_root option

v0.25.3 (2021-09-21)

• Enhancements

  • Track user preference for sidebar state

• Bug fixes

  • Do not double escape page titles on the sidebar
  • Do not fail when documenting cover compiled modules
  • Don't crash upon doc chunks for unknown beam languages

v0.25.2 (2021-09-02)

• Enhancements

... (truncated)

Commits

• 6de70a6 Release v0.26.0
• add7a0d Add translate="no" tags throughout the project
• f49e099 Update assets
• f4c234e Document how to render Mermaid graphs (#1435)
• e8a6163 Update README.md
• f4874bc Add a section on metadata
• cae6b20 Add optional module annotations (#1430)
• 1c66036 Introduce settings modal (#1429)
• 69b589d Bump elliptic from 6.5.2 to 6.5.4 in /assets (#1427)
• f828c15 Bump y18n from 4.0.0 to 4.0.3 in /assets (#1426)
• Additional commits viewable in compare view

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