Bump django from 1.10.4 to 1.11.23

Bumps [django](https://github.com/django/django) from 1.10.4 to 1.11.23.
- [Release notes](https://github.com/django/django/releases)
- [Commits](django/django@1.10.4...1.11.23)

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

Author: dependabot[bot]

requirements.txt

@@ -8,14 +8,15 @@ certifi==2018.11.29       # via requests
 chardet==3.0.4            # via requests
 django-amber==0.8.0
 django-appconf==1.0.2     # via django-compressor
+django-compressor==2.2
 django-dotenv==1.4.2
 django-markdown-deux==1.0.5
-django==1.10.4
-django_compressor==2.2
+django==1.11.23
 http-crawler==0.1.2       # via django-amber
 idna==2.8                 # via requests
 lxml==3.7.1               # via http-crawler
 markdown2==2.3.7          # via django-markdown-deux
+pytz==2019.3              # via django
 pyyaml==3.12              # via django-amber
 rcssmin==1.0.6            # via django-compressor
 requests==2.21.0