Bump Go version in go.mod (#4483)
Bump Go version in go.mod (#4483)

We made the switch to using go 1.13 language features, we need to reflect this in our metadata too.
EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse,EnMasseProject/enmasse