Updated test pypi url for deployment
Updated test pypi url for deployment

As we work to correct the build error for this branch #124, I have seen that even though twine is suggested, it may not be needed. 

TOX suggests using twine for secure uploads (https://tox.readthedocs.io/en/latest/plugins.html?highlight=twine) but since we leverage  travis encryption (https://docs.travis-ci.com/user/encryption-keys/), it may not be necessary.
nasa/podaacpy,lewismc/podaacpy,Omkar20895/podaacpy