Included shapely upgrade after installation

Hi @fd

Im sorry if this is taking too many MRs.

This MR includes the upgrade for shapely. this package handles all related to geometries. the reason I do this upgrade here is that the latest version (1.7.1) has many bugfixes that are important for my code. Still, if I force this version on the setup.py I cannot install babelgrid because it has not been updated in a while and it requires version 1.7.0 from shapely (In a practical sense, it works as well with 1.7.1). I had this done manually in RS1 and always worked properly.

\approve @fd