docs: libp2p-swarm was renamed to libp2p-switch (#196)
docs: libp2p-swarm was renamed to libp2p-switch (#196)

* docs: libp2p-swarm was renamed to libp2p-switch

Update the README accordingly.

* Fixing another typo

diasdavid/node-libp2p,diasdavid/js-libp2p