Fix for the upstream's change in the version #

It looks like the version is still composed of 3 variables in the same order: https://github.com/250bpm/nanomsg/commit/0a5ccfd5c7770c8122947d7e8895ee0e6d928403#L1R40

go-nanomsg.test.exe -test.run=TestVersion -test.v=true
=== RUN TestVersion
--- PASS: TestVersion (0.00 seconds)
PASS

Fixes #4