Updates Travis for wxPython 4.0.0b2
Updates Travis for wxPython 4.0.0b2

robotframework/RIDE,HelioGuilherme66/RIDE,HelioGuilherme66/RIDE,robotframework/RIDE,robotframework/RIDE,robotframework/RIDE,HelioGuilherme66/RIDE,HelioGuilherme66/RIDE