Log Message:
py-doc8: updated to 0.8.1

0.8.1
-----
* README: Further tweaks
* Resolve README issues
* Accept the :substitutions: option on code-block directives in Sphinx
* Ignore 'nowrap' option for 'math' directive

0.8.1rc3
--------
* Configure packaging and release
* Ignore 'label' option for 'math' directive
* doc8/checks: ignore emphasize-lines errors in Sphinx mode
* Accept the :caption: option on code-block directives in Sphinx

0.8.1rc2
--------
* Refactor to support direct invocation from python
* Add tests for command line invocation
* Standardise check name across python versions
* Adopt python black
* Enable pre-commit

0.8.1rc1
--------
* Fix formatting of pre-commit-hooks.yaml
* Fix '\_\_main\_\_'
* Added badges to the README
* Fix travis
* Fixed tox docs
* Add pre-commit hook definition
* Allow doc8 to be called as a module
* Integrate Travis
* Update hacking version
* gitignore: Ignore pbr generated metadata
* Modernize doc building process
* General cleanup
* setup.cfg: Indicate supported versions of Python
* CONTRIBUTING: Update after move to GitHub
* setup.cfg: Update author, maintainer details
* Add Pygments to the requirements list