Packages tables and netCDF4 removed from the requirements, so that lmgeo...

Packages tables and netCDF4 removed from the requirements, so that lmgeo becomes more easy to install.

requirements.txt

@@ -2,7 +2,5 @@ pyshp==2.1.0
 pyproj=1.9.5.1
 numpy==1.14.3
 tifffile==2019.3.18
-tables==3.5.2
-netCDF4==1.5.1.2
 libtiff==0.4.2
 delaunay-triangulation=1.0.3