Improved requirements section in README
Improved requirements section in README

matteo88/sbcatalog,kobe25/sbcatalog,michelesr/sbcatalog,befair/sbcatalog,kobe25/sbcatalog,kobe25/sbcatalog,matteo88/sbcatalog,michelesr/sbcatalog,matteo88/sbcatalog,michelesr/sbcatalog,befair/sbcatalog,befair/sbcatalog