Update tox instructions in the README

README.md

@@ -35,9 +35,13 @@ Testing and linting
 You may get errors about missing interpreters. That is normal and can be 
 ignored. If you want to run a specific check, you can do the following:
 
-    tox -e flake8  # Runs the flake8 linter
-    tox -e py34    # runs the tests with python 3.4
-    tox -e py35    # runs the tests with python 3.5
+    tox -e flake8           # Runs the flake8 linter
+    tox -e py34-django10    # runs the tests with python 3.4 and Django 1.10
+    tox -e py35-django10    # runs the tests with python 3.5 and Django 1.10
+    tox -e py36-django10    # runs the tests with python 3.6 and Django 1.10
+    tox -e py34-django11    # runs the tests with python 3.4 and Django 1.11
+    tox -e py35-django11    # runs the tests with python 3.5 and Django 1.11
+    tox -e py36-django11    # runs the tests with python 3.6 and Django 1.11
 
 Pillow dependencies
 -------------------