Merge pull request cookiecutter#1967 from pydanny/bugfix/windows-docker

Fix build error with windows=y and docker=y combination

{{cookiecutter.project_slug}}/requirements/base.txt

@@ -2,7 +2,7 @@ pytz==2018.9  # https://github.com/stub42/pytz
 python-slugify==2.0.1  # https://github.com/un33k/python-slugify
 Pillow==5.4.1  # https://github.com/python-pillow/Pillow
 {%- if cookiecutter.use_compressor == "y" %}
-rcssmin==1.0.6{% if cookiecutter.windows == 'y' %} --install-option="--without-c-extensions"{% endif %}  # https://github.com/ndparker/rcssmin
+rcssmin==1.0.6{% if cookiecutter.windows == 'y' and use_docker == 'n' %} --install-option="--without-c-extensions"{% endif %}  # https://github.com/ndparker/rcssmin
 {%- endif %}
 argon2-cffi==19.1.0  # https://github.com/hynek/argon2_cffi
 {%- if cookiecutter.use_whitenoise == 'y' %}