More inline docs for DATABASES variable (#1350)

* More inline docs for DATABASES variable

Use of database url is not part of Django, but comes from django-environ. Was initially confusing where feature came from, as link points to offical django docs.

* Contributors update

CONTRIBUTORS.rst

@@ -68,6 +68,7 @@ Listed in alphabetical order.
   Burhan Khalid            `@burhan`_                   @burhan
   Catherine Devlin         `@catherinedevlin`_
   Cédric Gaspoz            `@cgaspoz`_
+  Charlie Smith            `@chuckus`_
   Chris Curvey             `@ccurvey`_
   Chris Franklin
   Chris Franklin           `@hairychris`_
@@ -179,6 +180,7 @@ Listed in alphabetical order.
 .. _@cgaspoz: https://github.com/cgaspoz
 .. _@chrisdev: https://github.com/chrisdev
 .. _@ChrisPappalardo: https://github.com/ChrisPappalardo
+.. _@chuckus: https://github.com/chuckus
 .. _@Collederas: https://github.com/Collederas
 .. _@ddiazpinto: https://github.com/ddiazpinto
 .. _@dezoito: https://github.com/dezoito

{{cookiecutter.project_slug}}/config/settings/base.py

@@ -108,6 +108,8 @@ MANAGERS = ADMINS
 # DATABASE CONFIGURATION
 # ------------------------------------------------------------------------------
 # See: https://docs.djangoproject.com/en/dev/ref/settings/#databases
+# Uses django-environ to accept uri format
+# See: https://django-environ.readthedocs.io/en/latest/#supported-types
 DATABASES = {
     'default': env.db('DATABASE_URL', default='postgres://{% if cookiecutter.windows == 'y' %}localhost{% endif %}/{{cookiecutter.project_slug}}'),
 }