initial import from go-micro

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

go.mod

@@ -0,0 +1,18 @@
+module github.com/unistack-org/micro-plugin-registry-etcd
+
+go 1.15
+
+replace (
+	github.com/coreos/bbolt => go.etcd.io/bbolt v1.3.3
+	github.com/coreos/etcd => github.com/ozonru/etcd v3.3.20-grpc1.27-origmodule+incompatible
+	google.golang.org/grpc => google.golang.org/grpc v1.27.0
+)
+
+require (
+	github.com/coreos/etcd v3.3.18+incompatible
+	github.com/mitchellh/hashstructure v1.0.0
+	github.com/spf13/cobra v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/unistack-org/micro/v3 v3.0.0-20200821115321-c4a303190a68
+	go.uber.org/zap v1.15.0
+)