proto: update to grpc-gateway v1.8.6

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/golang/protobuf v1.3.1
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.0
 	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0
-	github.com/grpc-ecosystem/grpc-gateway v0.0.0-20170724004829-f2862b476edc
+	github.com/grpc-ecosystem/grpc-gateway v1.8.6
 	github.com/jackpal/gateway v1.0.5
 	github.com/jackpal/go-nat-pmp v0.0.0-20170405195558-28a68d0c24ad
 	github.com/jessevdk/go-flags v1.4.0
@@ -47,7 +47,7 @@ require (
 	golang.org/x/net v0.0.0-20190206173232-65e2d4e15006
 	golang.org/x/time v0.0.0-20180412165947-fbb02b2291d2
 	google.golang.org/genproto v0.0.0-20190201180003-4b09977fb922
-	google.golang.org/grpc v1.18.0
+	google.golang.org/grpc v1.19.0
 	gopkg.in/errgo.v1 v1.0.1 // indirect
 	gopkg.in/macaroon-bakery.v2 v2.0.1
 	gopkg.in/macaroon.v2 v2.0.0