Add new line at the end of examples to avoid nvc++ warning

Examples/cuda_sum_vec.cu

@@ -80,4 +80,4 @@ int main() {
     cudaFree(dev_vec_a);
     cudaFree(dev_vec_b);
     cudaFree(dev_vec_c);
-}
\ No newline at end of file
+}

Examples/future.cpp

@@ -44,4 +44,4 @@ int main() {
     });
 
     std::cout << "\n";
-}
\ No newline at end of file
+}

Examples/parallel_sort.cpp

@@ -14,4 +14,4 @@ int main() {
                                 v.begin(), v.end(), v_sorted.begin());
 
     std::cout << is_sorted << std::endl;
-}
\ No newline at end of file
+}