Bump ex_doc from 0.18.4 to 0.19.1

[dependabot-preview[bot]]

Bumps ex_doc from 0.18.4 to 0.19.1.

Changelog

*Sourced from [ex_doc's changelog](https://github.com/elixir-lang/ex_doc/blob/master/CHANGELOG.md).* > ## v0.19.1 > > * Enhancements > * Update CSS styles > * Remove sourcemaps from package > > ## v0.19.0 > > This release requires Elixir v1.7 and later. For earlier Elixir versions, use ExDoc ~> 0.18.0. > > * Enhancements > * Do not select "iex>" when selecting code samples > * Use makeup to perform ELixir's syntax highlighting (other languages still use highlight.js) > * Use `[rel="noopener"] on external links > * Link directly to page if sidebar item has no subitems > * Autolink Kernel and Kernel functions and special forms with shorthands (for example, only `is_atom/1` is necessary) > * Trim EEx contents to reduce HTML size > * Allow apps to be excluded from umbrella app docs > > * Bug fixes > * Exclude types with `[**typedoc**](https://github.com/typedoc) false` from the docs > * Make sure autolink considers the longest matching dependency name in case of shared prefixes > > ## v0.18.3 > > * Bug fix > * Fix formatting of typespecs causing errors > * Update jQuery > * Properly remove underscore from typespec links > > ## v0.18.2 > > * Enhancements > * Improve documentation pages for printing > * Autolink Kernel, Kernel.SpecialForms, and built-in types > * Annotate opaque types > * Add vertical-align:top to tables > * Allow module-function-arity references in links, for example: [some code](`MyMod.fun/2`) > * Remove underscore from view source link > * Run code formatter on typespecs (if one is available) > * Make night mode switch link more obvious > > ## v0.18.1 > > * Bug fixes > * Include missing formatter files > > ## v0.18.0 > > * Enhancements > ... (truncated)

Commits

- [`d54ea33`](https://github.com/elixir-lang/ex_doc/commit/d54ea33f5ccb06b66821c4c406214c60ba6ce31b) Release v0.19.1 - [`f58869c`](https://github.com/elixir-lang/ex_doc/commit/f58869ccb872c4257548bd818920a6a41463b929) Update README.md - [`7144c62`](https://github.com/elixir-lang/ex_doc/commit/7144c6239a79c5aabde6dc122fa93fe8bcfa9823) No longer write sourcemaps since in dev we don't minify - [`f7860bc`](https://github.com/elixir-lang/ex_doc/commit/f7860bcf630eb47b3759f6fb4d9362fcc4a13f8f) Remove --debug flag - [`b9ff990`](https://github.com/elixir-lang/ex_doc/commit/b9ff990db11cc67c263cd3a64e0a99f044610238) Only include .map files in dev builds - [`ed7d7e4`](https://github.com/elixir-lang/ex_doc/commit/ed7d7e4fa31e4d66d1f7e7df174bad8693f436db) Format codebase and check formatting on CI ([#880](https://github-redirect.dependabot.com/elixir-lang/ex_doc/issues/880)) - [`df3f15f`](https://github.com/elixir-lang/ex_doc/commit/df3f15fea712600ad9736a72248c579848a36486) Update travis - [`1f8aeee`](https://github.com/elixir-lang/ex_doc/commit/1f8aeee003b28dca274df5fa51ac734a4f5f269f) Use latest .css versions - [`0f5c27a`](https://github.com/elixir-lang/ex_doc/commit/0f5c27a4bbc2067e2b15607a97283a407ff6cc27) Add mix build instead of overriding mix docs - [`299ab6a`](https://github.com/elixir-lang/ex_doc/commit/299ab6a00e7ae226ca49e53e54293664eebddeea) Release v0.19.0 - Additional commits viewable in [compare view](https://github.com/elixir-lang/ex_doc/compare/v0.18.4...v0.19.1)

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[coveralls]

Coverage remained the same at 34.483% when pulling 1ae67b69852a2d97eba6f4c902b823441d3e4784 on dependabot/hex/ex_doc-0.19.1 into bd6fe5ed1bf0fe702068676f4124a226904d0ad7 on develop.

[dependabot-preview[bot]]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.