Update README.md

LBNL-ETA · May 24, 2019 · e112d40 · e112d40
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@@ -76,6 +76,8 @@ To add new system types (such as `Solar Thermal Retrofit`) one would need to map
         pip install -e .
 
     The `-e` flag is only necessary if one would like changes to the source code be reflected immediately (without having to rerun the `setup.py` script with every change to the source code). If you just want to run the project application, you can omit the `-e` flag.
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+    To use the plotting capabilities, also required when running tests, please install [`orca`](https://github.com/plotly/orca).
 
 ## Django Web Framework Deployment