Ignore plugins directory when running doc8 by itself outside of invoke

Author: tleonhardt

setup.cfg

@@ -16,6 +16,6 @@ force_grid_wrap = 0
 use_parentheses = true
 
 [doc8]
-ignore-path=docs/_build,.git,.idea,.pytest_cache,.tox,.nox,.venv,.vscode,build,cmd2,examples,tests,cmd2.egg-info,dist,htmlcov,__pycache__,*.egg
+ignore-path=docs/_build,.git,.idea,.pytest_cache,.tox,.nox,.venv,.vscode,build,cmd2,examples,tests,cmd2.egg-info,dist,htmlcov,__pycache__,*.egg,plugins
 max-line-length=117
 verbose=0