tox: flake8 - exclude directories starting with .

I use a .venv directory within the repo and flake8 ends up checking the
python modules within that directory. Exclude all directories which
begin with '.'.

Signed-off-by: Sachin Prabhu <[email protected]>

tox.ini

@@ -29,7 +29,7 @@ commands = pytest -vrfEsxXpP testcases/consistency
 [testenv:flake8]
 deps = flake8
 changedir = {toxinidir}
-commands = flake8 .
+commands = flake8 --exclude=.* .
 
 [testenv:black]
 deps = black>=23.3.0