Install optional geopandas dependency on try-gmt?

[weiji14]

Should we install geopandas (an optional dependency of PyGMT) on try-gmt? Just asking because a new contributor trying to work on GenericMappingTools/pygmt#1374 is having trouble with setting up PyGMT and Geopandas locally, and it would be nice to have a virtual cloud environment with both these dependencies installed already.

Disadvantage is that the build and start-time for the Binder environment will take longer, because geopandas brings in some heavy dependencies like GEOS and PROJ (see https://geopandas.org/getting_started/install.html#dependencies).

Thoughts? Upvote 👍 to go for it, downvote 👎 for sticking to the status quo.