Support go modules import now that is the default dep management tool for go

[Alok Kumar Singh]

$ go get "github.com/Clever/pq"
go: github.com/Clever/pq upgrade => v0.0.0-20190927032255-278004c23b92
go get: github.com/Clever/pq@v0.0.0-20190927032255-278004c23b92: parsing go.mod:
	module declares its path as: github.com/lib/pq
	        but was required as: github.com/Clever/pq