Update dependencies, go.mod, go.sum

[butanian]

To update dependencies:
gorepoman -d vendor update go.opencensus.io
gorepoman -d vendor update aws-sdk-go
gorepoman -d vendor update github.com/golang/protobuf
gorepoman -d vendor update github.com/lib/pq
gorepoman -d vendor update google.golang.org/grpc
gorepoman -d vendor reconcile cloud.google.com/go

To update go.sum
go mod tidy

Edit: 9/10/2019
I also had to update one of the rows in the travis build matrix. When building with G 1.11 and modules, I had to specifically use a version higher than 11.3, to make building golang.org/x/sys/unix possible. Failure here: https://travis-ci.org/fullstorydev/hauser/jobs/583168386

Github issue that expands on the problem, and provides the alternative: golang/go#30446

[butanian]

@jameremo thank you for the help yesterday. PTAL

I also had to update the travis matrix to specifically use Go 1.11.4 when GO111MODULE is on. Updated the PR comment above with the reasons.

[jameremo]

LGTM, nice to have the deps updated! 🎉