Update package dependencies for samples.

Examples/Datastore/PackageManager/Package.swift

@@ -17,8 +17,8 @@ import PackageDescription
 let package = Package (
     name: "Datastore",
     dependencies: [
-        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,1,13)),
-        .Package(url: "https://github.com/apple/swift-protobuf.git", Version(0,9,903)),
+        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,2,0)),
+        .Package(url: "https://github.com/apple/swift-protobuf.git", Version(0,9,904)),
         .Package(url: "https://github.com/google/auth-library-swift.git", Version(0,2,2)),
     ]
 )

Examples/Echo/PackageManager/Package.swift

@@ -17,7 +17,7 @@ import PackageDescription
 let package = Package (
     name: "Echo",
     dependencies: [
-        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,1,12)),
-        .Package(url: "https://github.com/apple/swift-protobuf.git", Version(0,9,903)),
+        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,2,0)),
+        .Package(url: "https://github.com/apple/swift-protobuf.git", Version(0,9,904)),
     ]
 )

Examples/Simple/PackageManager/Package.swift

@@ -17,6 +17,6 @@ import PackageDescription
 let package = Package (
     name: "Simple",
     dependencies: [
-        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,1,12)),
+        .Package(url: "https://github.com/grpc/grpc-swift.git", Version(0,2,0)),
     ]
 )