Bump sphinxcontrib-applehelp from 1.0.3 to 1.0.4

Bumps [sphinxcontrib-applehelp](https://github.com/sphinx-doc/sphinxcontrib-applehelp) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/sphinx-doc/sphinxcontrib-applehelp/releases)
- [Changelog](https://github.com/sphinx-doc/sphinxcontrib-applehelp/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinxcontrib-applehelp@1.0.3...1.0.4)

---
updated-dependencies:
- dependency-name: sphinxcontrib-applehelp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

doc/requirements.txt

@@ -1,6 +1,6 @@
 sphinx-rtd-theme==1.1.1
 sphinx-argparse==0.4.0
-sphinxcontrib-applehelp==1.0.3; python_version >= "3.5"
+sphinxcontrib-applehelp==1.0.4; python_version >= "3.5"
 sphinxcontrib-devhelp==1.0.2; python_version >= "3.5"
 sphinxcontrib-htmlhelp==2.0.0; python_version >= "3.5"
 sphinxcontrib-jsmath==1.0.1; python_version >= "3.5"