Update CONTRIBUTING.md w/ stipulation that go 1.13 is not yet supported
Update CONTRIBUTING.md w/ stipulation that go 1.13 is not yet supported

kingland/consul,42wim/consul,scalp42/consul,42wim/consul,hashicorp/consul,kingland/consul,kingland/consul,hashicorp/consul,42wim/consul,kingland/consul,scalp42/consul,kingland/consul,42wim/consul,scalp42/consul,hashicorp/consul,scalp42/consul,hashicorp/consul,scalp42/consul,42wim/consul