Upgrade protobuf, prometheus and logrus

Jacob Vosmaerrequested to merge
jv-prometheus-0.9.3 into master
  • github.com/golang/protobuf from v1.3.0 to v1.3.1
  • github.com/prometheus/client_golang from v0.9.0 to v0.9.3
  • github.com/sirupsen/logrus from v1.1.1 to v1.2.0

I only upgraded prometheus, these other changes happened as knock-on effects because of the go mod version selection algorithm.

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