Updating Django for my web based application

Hi, 

Currently my application is developed with Django 1.9.8 and I want to upgrade it to 2.0.3 because 

Django 1.9.8 is an insecure version of django as mention on it official documentation.

https://docs.djangoproject.com/en/1.9/internals/release-process/#backwards-compatibility-policy

This document is for an insecure version of Django that is no longer supported. Please upgrade to a newer release!

Its my first time to update Django Version for my application,

I have updated the Dango 1.9.8 to Django 2.0.3 in my virtual environment.
I am using Python 3.4.4

I haven't changes any thing in the code yet and facing some error

\virtualEnv\DjangoUp\lib\site-packages\rest_framework\routers.py", line 23, in <module>

from django.core.urlresolvers import NoReverseMatch

ImportError: No module named 'django.core.urlresolvers'

Some question that are coming into my mind:

• Do i have to update my application according to new Django release every time when new Django version releases?
• Is there any article or blog written that can help me to upgrade Django version from Django 1.9.8 to Django 2.0.3?
• What people follow, dose most of the developers upgrade there web application according to new Django version release?

Any kind of help will be appreciated, Thanks in advance.

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