Update travis.yml to install swig 3.0.6
Update travis.yml to install swig 3.0.6
opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core