add version 3 details for go modules

fixes #327 vgo: mix of old-/new- import paths in `v1.3.0`

This essentially is the same as 1.3.0, but with the new
nanomsg.org imports.

fixes #327 vgo: mix of old-/new- import paths in `v1.3.0`

This essentially is the same as 1.3.0, but with the new
nanomsg.org imports.

Tag new 1.3.0 release.

Changes include IPC support on Windows, asynchronous name resolution,
and numerous bug fixes.

fixes #222 Add support for wildcard binding

fixes #86 Reconnect interval too long, needs backoff handling

fixes #43 TestBusTLS test failures