update travis.yml
update travis.yml

pratyakshs/pgmpy,liquidmetal/pgmpy,ankurankan/pgmpy,ankurankan/pgmpy,sandeepkrjha/pgmpy,khalibartan/pgmpy,pgmpy/pgmpy,vivek425ster/pgmpy,abinashpanda/pgmpy,palashahuja/pgmpy,kislayabhi/pgmpy,kris-singh/pgmpy,jhonatanoliveira/pgmpy,yashu-seth/pgmpy,palashahuja/pgmpy,khalibartan/pgmpy,anaviltripathi/pgmpy,yashu-seth/pgmpy,pgmpy/pgmpy,jhonatanoliveira/pgmpy,abinashpanda/pgmpy,anaviltripathi/pgmpy,sandeepkrjha/pgmpy,pratyakshs/pgmpy,liquidmetal/pgmpy,kris-singh/pgmpy,kislayabhi/pgmpy,vivek425ster/pgmpy