Fix setup.py to actually install the base_classes submodule
Fix setup.py to actually install the base_classes submodule

jendas1/PyLaTeX,ovaskevich/PyLaTeX,sebastianhaas/PyLaTeX,votti/PyLaTeX,bjodah/PyLaTeX,jendas1/PyLaTeX,bjodah/PyLaTeX,votti/PyLaTeX,JelteF/PyLaTeX,sebastianhaas/PyLaTeX,ovaskevich/PyLaTeX,JelteF/PyLaTeX