Update pytz from 2018.9 to 2019.1
-pytz==2018.9 # https://github.com/stub42/pytz
+pytz==2019.1 # https://github.com/stub42/pytz
python-slugify==3.0.2 # https://github.com/un33k/python-slugify
Pillow==6.0.0 # https://github.com/python-pillow/Pillow
{%- if cookiecutter.use_compressor == "y" %}
