Update README.md for error when using Qt5Agg/PyCharm

README.md

@@ -78,3 +78,6 @@ been corrected for systematic errors, so actual elevations should be taken from
 - [ ] Investigate using [modin](https://github.com/modin-project/modin) to help speed up analysis.
 - [X] Need to think about how relative imports are handled, see [here](https://chrisyeh96.github.io/2017/08/08/definitive-guide-python-imports.html). Maybe the click CLI interface should be moved to the `./src/` folder and it can import all the other packages?
 - [ ] Simplify runup_models in Stockdon06 - we should really only have one function for each runup model. Need to make it work with individual values or entire dataframe. Use [np.maskedarray](https://docs.scipy.org/doc/numpy-1.15.0/reference/maskedarray.generic.html)
+
+## Misc
+If Qt5Agg error comes up when trying to plot in PyCharm: https://stackoverflow.com/a/42231526