Bump sphinxcontrib-htmlhelp from 2.0.0 to 2.0.1

Bumps [sphinxcontrib-htmlhelp](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp) from 2.0.0 to 2.0.1.
- [Release notes](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/releases)
- [Changelog](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/master/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/commits)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

doc/requirements.txt

@@ -2,7 +2,7 @@ sphinx-rtd-theme==1.1.1
 sphinx-argparse==0.4.0
 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-htmlhelp==2.0.1; python_version >= "3.5"
 sphinxcontrib-jsmath==1.0.1; python_version >= "3.5"
 sphinxcontrib-qthelp==1.0.3; python_version >= "3.5"
 sphinxcontrib-serializinghtml==1.1.5; python_version >= "3.5"