Add dependency of shapely separately as Geopandas is dependency for building docs

[sackh]

Signed-off-by: Kharude, Sachin [email protected]

@davidbrochart - We need to add the dependency of shapely, as geopandas is the only dependency for building docs, hence docs build is not failing.
When I tested WKT functionality geopandas was already installed in my env hence it did not fail.
Now, when I created a new environment from scratch it fails as shapely is not added as a dependency. Hence adding it as a dependency.

[martinRenou]

I am not sure I get why we need shapely as dependency, is it used in ipyleaflet? Other than in the docs?

[sackh]

@martinRenou - I added a new feature called WKTLayer in #679, which needs shapely, I thought geopandas is dependency hence I did not add it initially as shapely is a dependency of Geopandas. but later realized that geopandas is only required for docs, hence we need shapely as a dependency for ipyleaflet.

[martinRenou]

I need to catch up on notifications, I did not look at the WKT PR yet, sorry!