Fix quotes in tox.ini

Author: atodorov

tox.ini

@@ -21,7 +21,7 @@ commands =
     django_is_installed: pylint --load-plugins=pylint_django --disable=E5110 setup.py
     flake8: flake8
     pylint: pylint --rcfile=tox.ini -d missing-docstring,too-many-branches,too-many-return-statements,too-many-ancestors,fixme --ignore=tests pylint_django setup
-    readme: bash -c \'python setup.py -q sdist && twine check dist/*\'
+    readme: bash -c "python setup.py -q sdist && twine check dist/*"
     py{36}-django{111,20,-master}: coverage run pylint_django/tests/test_func.py -v
     py{36,37,38,39}-django{22,30,31,32}: coverage run pylint_django/tests/test_func.py -v
     clean: find . -type f -name '*.pyc' -delete