update thumbnails to use go-micro v3

thumbnails/go.mod

@@ -8,14 +8,13 @@ require (
 	contrib.go.opencensus.io/exporter/zipkin v0.1.1
 	github.com/Masterminds/sprig/v3 v3.2.2 // indirect
 	github.com/UnnoTed/fileb0x v1.1.4
+	github.com/asim/go-micro/v3 v3.5.0
 	github.com/cespare/reflex v0.2.0
 	github.com/go-test/deep v1.0.2-0.20181118220953-042da051cf31 // indirect
-	github.com/gogo/protobuf v1.3.1 // indirect
 	github.com/golang/protobuf v1.4.3
 	github.com/huandu/xstrings v1.3.2 // indirect
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/micro/cli/v2 v2.1.2
-	github.com/micro/go-micro/v2 v2.9.1
 	github.com/mitchellh/copystructure v1.1.1 // indirect
 	github.com/ogier/pflag v0.0.1
 	github.com/oklog/run v1.1.0
@@ -31,9 +30,7 @@ require (
 	go.opencensus.io v0.22.6
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
 	golang.org/x/image v0.0.0-20190802002840-cff245a6509b
-	golang.org/x/mod v0.4.1 // indirect
 	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c // indirect
-	google.golang.org/genproto v0.0.0-20200918140846-d0d605568037 // indirect
 	google.golang.org/protobuf v1.25.0
 )