Update sphinx from 1.8.5 to 2.0.0
Werkzeug==0.15.1 # https://github.com/pallets/werkzeug
ipdb==0.12 # https://github.com/gotcha/ipdb
-Sphinx==1.8.5 # https://github.com/sphinx-doc/sphinx
+Sphinx==2.0.0 # https://github.com/sphinx-doc/sphinx
{%- if cookiecutter.use_docker == 'y' %}
psycopg2==2.7.4 --no-binary psycopg2 # https://github.com/psycopg/psycopg2
{%- else %}
