deps: drop tox as we don't use it now

README.md

@@ -23,26 +23,15 @@ This repository serves the website of PyCon TW, Python Conference Taiwan. This p
 
 ## Run Tests
 
-Tests are managed with [pytest-django](http://pytest-django.readthedocs.org/en/latest/tutorial.html). You have two options to run tests, either with the local environment, or in an isolated one via [Tox](http://tox.readthedocs.org/en/latest/).
+Tests are managed with [pytest-django](http://pytest-django.readthedocs.org/en/latest/tutorial.html). You can run tests in your local environment:
 
+- Run the following command inside `src`:
 
-### Testing in the Local Environment
+        pytest
 
-Run the following command inside `src`:
-
-    pytest
-
-To run tests with coverage report:
-
-    pytest --cov=.
-
-
-### Testing with Tox
-
-Run the following inside the top-level directory (the one with `tox.ini`):
-
-    tox
+- To run tests with coverage report:
 
+        pytest --cov=.
 
 ## How to Contribute
 

requirements/base.txt

@@ -89,7 +89,7 @@ urllib3==1.26.5
 
 # For upload to Google cloud storage
 google-cloud-storage==1.36.1
-django-storages==1.11.1;
+django-storages==1.11.1
 
 # Django REST framework: a powerful and flexible toolkit for building Web APIs.
 # https://www.django-rest-framework.org/