Upgrade: Django 2.0.5

    Also, following packages are updated:

    - Pillow
    - ipython
    - django-extensions
    - gunicorn
    - psycopg2
    - dj-database-url

requirements/base.pip

-Django==2.0.1
-Pillow==5.0.0
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+Django==2.0.5
+Pillow==5.1.0
\ No newline at end of file

requirements/development.pip

 -r base.pip
-ipython==6.2.1
-django-extensions==1.9.8
+ipython==6.3.1
+django-extensions==2.0.7
 Werkzeug==0.14.1
 django-debug-toolbar==1.9.1
\ No newline at end of file

requirements/heroku.pip

 -r base.pip
-gunicorn==19.7.1
-psycopg2==2.7.3.2
-dj-database-url==0.4.2
+gunicorn==19.8.1
+psycopg2==2.7.4
+dj-database-url==0.5.0
 whitenoise==3.3.1
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