fix doc reqs

Author: bckohan

doc/requirements.txt

@@ -6,4 +6,4 @@ sphinxcontrib-htmlhelp==1.0.3; python_version >= "3.5"
 sphinxcontrib-jsmath==1.0.1; python_version >= "3.5"
 sphinxcontrib-qthelp==1.0.3; python_version >= "3.5"
 sphinxcontrib-serializinghtml==1.1.4; python_version >= "3.5"
-django-render-static=0.1.0
+django-render-static==0.1.0