README.md minor edit
@@ -76,6 +76,7 @@ export PYTHONPATH=$PYTHONPATH:$HOME/git/pymanoid
To build and view the documentation, install
[sphinx](http://www.sphinx-doc.org/en/stable/index.html) then do
``` shell
+pip install sphinx_rtd_theme
cd <toppra-dir>/docs/
make clean && make html
<google-chrome> build/index.html
