Update linting paths for new code structure

{{cookiecutter.project_slug}}/tox.ini

@@ -31,14 +31,14 @@ usedevelop = False
 envdir = {toxworkdir}/linting
 commands =
     pep8: {envpython} -m flake8 --version
-    pep8: {envpython} -m flake8 --extend-exclude './.venv/','./venv/'
+    pep8: {envpython} -m flake8 src tests
     black: {envpython} -m black --version
-    black: {envpython} -m black --check --diff .
+    black: {envpython} -m black --check --diff src tests
     pylint: {envpython} -m pylint --version
-    pylint: {envpython} -m pylint {{cookiecutter.project_slug}} tests
-    format: {envpython} -m autopep8 -v -aa --in-place --recursive {{cookiecutter.project_slug}}
+    pylint: {envpython} -m pylint src tests
+    format: {envpython} -m autopep8 -v -aa --in-place --recursive src
     format: {envpython} -m autopep8 -v -aa --in-place --recursive tests
-    format: {envpython} -m black -v .
+    format: {envpython} -m black -v src tests
 
 [testenv:{build-local,build-ci-linux}]
 deps =