Report protocol on 'remove' event

Author: cmaglie

sync_darwin.go

@@ -125,7 +125,10 @@ func startSync() (chan<- bool, error) {
 					if !portListHas(updates, port) {
 						output(&syncOutputJSON{
 							EventType: "remove",
-							Port:      &boardPortJSON{Address: port.Name},
+							Port: &boardPortJSON{
+								Address:  port.Name,
+								Protocol: "serial",
+							},
 						})
 					}
 				}

sync_linux.go

@@ -98,7 +98,10 @@ func startSync() (chan<- bool, error) {
 			if evt.Action == "remove" {
 				output(&syncOutputJSON{
 					EventType: "remove",
-					Port:      &boardPortJSON{Address: changedPort},
+					Port: &boardPortJSON{
+						Address:  changedPort,
+						Protocol: "serial",
+					},
 				})
 			}
 		}

sync_windows.go

@@ -170,7 +170,10 @@ func startSync() (chan<- bool, error) {
 				if !portListHas(updates, port) {
 					output(&syncOutputJSON{
 						EventType: "remove",
-						Port:      &boardPortJSON{Address: port.Name},
+						Port: &boardPortJSON{
+							Address:  port.Name,
+							Protocol: "serial",
+						},
 					})
 				}
 			}