Upgrade Django middleware settings

- https://docs.djangoproject.com/en/1.11/topics/http/middleware/#upgrading-pre-django-1-10-style-middleware
- https://docs.djangoproject.com/en/1.11/topics/http/middleware/#activating-middleware
- https://docs.djangoproject.com/en/1.11/topics/auth/default/#session-invalidation-on-password-change

Signed-off-by: Maurício Meneghini Fauth <mauricio@fauth.dev>

pmaweb/settings.py

@@ -75,15 +75,15 @@
     'pmaweb',
 )
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = [
+    'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-)
+]
 
 TEMPLATES = [
     {