Updated libp2p deps and removed the libp2p datastore

dependency updates, removed p2p datastore (#10)

* dependency updates, removed p2p datastore

Namespace Prefixes

This is a major change. The code was already adding path prefixes to stream names. Now it adds the same prefix to every advertised namespace.

go version and dependency updates

v0.2.1

linter, go version and dependency upgrades (#8)

v0.2.0

AdvertisedNamespacesFunc is now set during the Host's contructor (#5)

first release

advertisement callback now returns the list of provided namespaces (#4)

* changed advertisement callback to return the provided namespaces

* added linting support

* can't refresh namespaces before discovery loop is started

* fixed log message

* removed incorrect comment

* RefreshNamespaces renamed Advertise