update travis
update travis

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