Add psinet coverage to Travis config

.travis.yml

@@ -21,6 +21,7 @@ script:
 - go test -v -covermode=count -coverprofile=protocol.coverprofile ./common/protocol
 - go test -v -covermode=count -coverprofile=transferstats.coverprofile ./transferstats
 - go test -v -covermode=count -coverprofile=server.coverprofile ./server
+- go test -v -covermode=count -coverprofile=psinet.coverprofile ./server/psinet
 - go test -v -covermode=count -coverprofile=psiphon.coverprofile
 - $HOME/gopath/bin/gover
 - $HOME/gopath/bin/goveralls -coverprofile=gover.coverprofile -service=travis-ci -repotoken $COVERALLS_TOKEN