updated the .travis.yml file to do a rehash before executing conda
updated the .travis.yml file to do a rehash before executing conda

orbitfold/tardis,orbitfold/tardis,Tobychev/tardis,kaushik94/tardis,kaushik94/tardis,Minhmo/tardis,orbitfold/tardis,kaushik94/tardis,kaushik94/tardis,Tobychev/tardis,Minhmo/tardis,Tobychev/tardis,orbitfold/tardis,Minhmo/tardis