django.core.context_processors.request is now django.template.context_processors.request

[liquidmetalrob]

In current Django versions:
django.core.context_processors.request is now
django.template.context_processors.request

It should also be noted that in order to enable it you need to add it here:

TEMPLATES = [{
...
'OPTIONS': {
'context_processors': [
'django.template.context_processors.request',
]
},
}]