Refs #265. try using trusted host

Author: kylegibson-rldatix

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
           run: |
             cd /workspace
             python --version
-            pip install "Jinja2==2.10" "MarkupSafe<2.0" "coverage==3.6" "nose==1.30" "flake8==2.6.2"
+            pip install --trusted-host pypi.org --index-url=http://pypi.org/simple "Jinja2==2.10" "MarkupSafe<2.0" "coverage==3.6" "nose==1.30" "flake8==2.6.2"
             pip install -e .
             nosetests --with-doctest