Fix some warnings with the examples (#39)

Author: FranzBusch

Package.swift

@@ -171,69 +171,54 @@ let package = Package(
                 .target(name: "Temporal")
             ],
             path: "Examples/Greeting",
-            swiftSettings: [
-                .define("GRPCNIOTransport")
-            ]
         ),
         .executableTarget(
             name: "MultipleActivitiesExample",
             dependencies: [
                 .target(name: "Temporal")
             ],
             path: "Examples/MultipleActivities",
-            swiftSettings: [
-                .define("GRPCNIOTransport")
-            ]
+            exclude: ["README.md"],
         ),
         .executableTarget(
             name: "ErrorHandlingExample",
             dependencies: [
                 .target(name: "Temporal")
             ],
             path: "Examples/ErrorHandling",
-            swiftSettings: [
-                .define("GRPCNIOTransport")
-            ]
+            exclude: ["README.md"],
         ),
         .executableTarget(
             name: "SignalExample",
             dependencies: [
                 .target(name: "Temporal")
             ],
             path: "Examples/Signals",
-            swiftSettings: [
-                .define("GRPCNIOTransport")
-            ]
+            exclude: ["README.md"],
         ),
         .executableTarget(
             name: "AsyncActivitiesExample",
             dependencies: [
                 .target(name: "Temporal")
             ],
             path: "Examples/AsyncActivities",
-            swiftSettings: [
-                .define("GRPCNIOTransport")
-            ]
+            exclude: ["README.md"],
         ),
         .executableTarget(
             name: "ScheduleExample",
             dependencies: [
                 .target(name: "Temporal")
             ],
             path: "Examples/Schedule",
-            swiftSettings: [
-                .define("GRPCNIOTransport")
-            ]
+            exclude: ["README.md"],
         ),
         .executableTarget(
             name: "ChildWorkflowExample",
             dependencies: [
                 .target(name: "Temporal")
             ],
             path: "Examples/ChildWorkflows",
-            swiftSettings: [
-                .define("GRPCNIOTransport")
-            ]
+            exclude: ["README.md"],
         ),
 
         // MARK: Tests