add newline to the end of generated files

src/compiler/csharp_generator.cc

@@ -489,7 +489,7 @@ grpc::string GetServices(const FileDescriptor *file) {
   }
   out.Outdent();
   out.Print("}\n");
-  out.Print("#endregion");
+  out.Print("#endregion\n");
   return output;
 }
 

src/csharp/Grpc.Examples/MathGrpc.cs

@@ -119,4 +119,4 @@ namespace math {
     }
   }
 }
-#endregion
+#endregion

src/csharp/Grpc.IntegrationTesting/TestGrpc.cs

@@ -156,4 +156,4 @@ namespace grpc.testing {
     }
   }
 }
-#endregion
+#endregion