README typo fix

README.md

@@ -78,5 +78,6 @@ For more command see the `gulpfile.js` file.
 
 Run all tests for the project with the following command within the SSH session:
 
-``` DJANGO_SETTINGS_MODULE=opentech.settings.test python manage.py test --keepdb
+``` bash
+DJANGO_SETTINGS_MODULE=opentech.settings.test python manage.py test --keepdb
 ```