Update Echo PackageManager example for 0.1.9 API.

Examples/Echo/PackageManager/Package.swift

@@ -34,7 +34,7 @@ import PackageDescription
 let package = Package (
     name: "Echo",
     dependencies: [
-        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,1,8)),
+        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,1,9)),
         .Package(url: "https://github.com/apple/swift-protobuf.git", Version(0,9,24)),
     ]
 )

Examples/Echo/PackageManager/Sources/main.swift

@@ -127,7 +127,7 @@ if client != "" {
   if client == "expand" {
     let requestMessage = Echo_EchoRequest(text:message)
     print("Sending: " + requestMessage.text)
-    let expandCall = try service.expand(requestMessage)
+    let expandCall = try service.expand(requestMessage) {result in }
     var running = true
     while running {
       do {
@@ -142,7 +142,7 @@ if client != "" {
 
   // Client streaming
   if client == "collect" {
-    let collectCall = try service.collect()
+    let collectCall = try service.collect() {result in }
 
     let parts = message.components(separatedBy:" ")
     for part in parts {
@@ -158,7 +158,7 @@ if client != "" {
 
   // Bidirectional streaming
   if client == "update" {
-    let updateCall = try service.update()
+    let updateCall = try service.update() {result in}
 
     DispatchQueue.global().async {
       var running = true