Fixed typo in readme
Fixed typo in readme

kris-singh/pgmpy,ankurankan/pgmpy,kris-singh/pgmpy,ankurankan/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,pgmpy/pgmpy,sandeepkrjha/pgmpy,abinashpanda/pgmpy,jhonatanoliveira/pgmpy,pgmpy/pgmpy,abinashpanda/pgmpy,khalibartan/pgmpy,jhonatanoliveira/pgmpy