Bump dj-database-url from 0.4.2 to 0.5.0

Bumps [dj-database-url](https://github.com/kennethreitz/dj-database-url) from 0.4.2 to 0.5.0.
- [Release notes](https://github.com/kennethreitz/dj-database-url/releases)
- [Commits](kennethreitz/dj-database-url@v0.4.2...v0.5.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support

requirements.txt

@@ -1,6 +1,6 @@
 certifi==2018.11.29
 chardet==3.0.4
-dj-database-url==0.4.2
+dj-database-url==0.5.0
 Django==1.11.20
 django-dotenv==1.4.2
 django-webpack-loader==0.6.0