Update Echo PackageManager sample to 0.1.10 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(0,1,9)),
+        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,1,10)),
         .Package(url: "https://github.com/apple/swift-protobuf.git", Version(0,9,24)),
     ]
 )

Examples/Echo/PackageManager/Sources/main.swift

@@ -148,7 +148,7 @@ if client != "" {
     for part in parts {
       let requestMessage = Echo_EchoRequest(text:part)
       print("Sending: " + part)
-      try collectCall.send(requestMessage)
+      try collectCall.send(requestMessage) {error in print(error)}
       sleep(1)
     }
 
@@ -180,7 +180,7 @@ if client != "" {
     for part in parts {
       let requestMessage = Echo_EchoRequest(text:part)
       print("Sending: " + requestMessage.text)
-      try updateCall.send(requestMessage)
+      try updateCall.send(requestMessage) {error in print(error)}
       sleep(1)
     }
     try updateCall.closeSend()