BUILD: Update Consul APIs to 1.4.0 and Consul to 1.7.2 (#28)

This will allow to have the same code in:
hashicorp/consul#7637

And will fix #19

consul/watcher.go

@@ -111,11 +111,11 @@ func (w *Watcher) handleProxyChange(first bool, srv *api.AgentService) {
 	w.downstream.LocalBindAddress = defaultDownstreamBindAddr
 	w.downstream.LocalBindPort = srv.Port
 	w.downstream.TargetAddress = defaultUpstreamBindAddr
-	if srv.Connect != nil && srv.Connect.Proxy != nil && srv.Connect.Proxy.Config != nil {
-		if b, ok := srv.Connect.Proxy.Config["bind_address"].(string); ok {
+	if srv.Connect != nil && srv.Connect.SidecarService != nil && srv.Connect.SidecarService.Proxy != nil && srv.Connect.SidecarService.Proxy.Config != nil {
+		if b, ok := srv.Connect.SidecarService.Proxy.Config["bind_address"].(string); ok {
 			w.downstream.LocalBindAddress = b
 		}
-		if a, ok := srv.Connect.Proxy.Config["local_service_address"].(string); ok {
+		if a, ok := srv.Connect.SidecarService.Proxy.Config["local_service_address"].(string); ok {
 			w.downstream.TargetAddress = a
 		}
 	}

go.mod

@@ -15,16 +15,14 @@ require (
 	github.com/go-openapi/runtime v0.19.0 // indirect
 	github.com/go-openapi/spec v0.19.0 // indirect
 	github.com/haproxytech/models v1.2.0
-	github.com/hashicorp/consul v1.5.1
-	github.com/hashicorp/consul/api v1.1.0
+	github.com/hashicorp/consul v1.7.2
+	github.com/hashicorp/consul/api v1.4.0
 	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/mailru/easyjson v0.0.0-20190403194419-1ea4449da983 // indirect
 	github.com/pkg/errors v0.8.1
-	github.com/prometheus/client_golang v0.0.0-20180328130430-f504d69affe1
+	github.com/prometheus/client_golang v0.9.2
 	github.com/sirupsen/logrus v1.4.2
 	github.com/stretchr/testify v1.4.0
-	golang.org/x/net v0.0.0-20190607181551-461777fb6f67 // indirect
-	golang.org/x/sys v0.0.0-20190528012530-adf421d2caf4 // indirect
 	golang.org/x/text v0.3.2 // indirect
 	gopkg.in/d4l3k/messagediff.v1 v1.2.1
 	gopkg.in/mcuadros/go-syslog.v2 v2.2.1