minor update in authors.rst
minor update in authors.rst

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