Bump django-appconf from 1.0.2 to 1.0.3

[dependabot-preview]

Bumps django-appconf from 1.0.2 to 1.0.3.

Changelog

Sourced from django-appconf's changelog.

1.0.3 (2019-03-3)

Packaging metadata updates:

• Update tox configuration to match Django Python support map
• Drop support for Django 1.8, 1.9 and 1.10
• Drop support for python 3.3
• Confirm support for Django 1.11, 2.0 and 2.1
• Confirm support for python 3.7

Commits

• a78319e Bump version and update changelog for v1.0.3 release.
• 022ac6a Add package classifiers for Python 3.7 support (#46)
• 207c1b2 Migrate from django.utils.six to six (#44)
• 9b53964 Drop Python 3.5 support for Django master (#45)
• 998d3a5 Follow django Python support map, add tox/travis targets for stable django 2....
• 192b71c add django as a requirement to setup.py (#40)
• 35728b7 Add syntax highlighting (#39)
• 1766d00 Updates README.rst with svg badge (#38)
• 7b02063 Merge pull request #37 from hsmett/develop
• 1c2d746 Follow django Python support map, add test for stable django 1.10 and 1.11
• Additional commits viewable in compare view

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