Update travis config with tox matrix
Update travis config with tox matrix

SublimeLinter/SublimeLinter3,ikappas/SublimeLinter3,zenlambda/SublimeLinter3,paulirish/SublimeLinter3,ikappas/SublimeLinter3,SublimeLinter/SublimeLinter3,jasonrhaas/SublimeLinter3,simonzack/SublimeLinter3,paulirish/SublimeLinter3,zenlambda/SublimeLinter3,simonzack/SublimeLinter3,jasonrhaas/SublimeLinter3,smanolloff/SublimeLinter3,smanolloff/SublimeLinter3