Bump ex_doc from 0.18.3 to 0.18.4

[dependabot-preview[bot]]

Bumps ex_doc from 0.18.3 to 0.18.4.

Changelog

*Sourced from [ex_doc's changelog](https://github.com/elixir-lang/ex_doc/blob/master/CHANGELOG.md).* > # Changelog

Commits

- [`146c9b3`](https://github.com/elixir-lang/ex_doc/commit/146c9b3c4be67c292dbe545c85e574e734699b82) Release v0.18.4 - See full diff in [compare view](https://github.com/elixir-lang/ex_doc/compare/v0.18.3...v0.18.4)

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[coveralls]

Coverage remained the same at 86.486% when pulling 1ac5f8d9bcc58e0610e60ec773ef10fa4d151a2e on dependabot/hex/ex_doc-0.18.4 into 6cceceeeb7cccfb6b1d93bddac85c761ace34a66 on master.

[coveralls]

Coverage remained the same at 86.486% when pulling 1ac5f8d9bcc58e0610e60ec773ef10fa4d151a2e on dependabot/hex/ex_doc-0.18.4 into 6cceceeeb7cccfb6b1d93bddac85c761ace34a66 on master.