Add reference to BENCHMARK_MAIN in README

README.md

@@ -27,17 +27,7 @@ static void BM_StringCopy(benchmark::State& state) {
 }
 BENCHMARK(BM_StringCopy);
 
-// Augment the main() program to invoke benchmarks if specified
-// via the --benchmarks command line flag.  E.g.,
-//       my_unittest --benchmark_filter=all
-//       my_unittest --benchmark_filter=BM_StringCreation
-//       my_unittest --benchmark_filter=String
-//       my_unittest --benchmark_filter='Copy|Creation'
-int main(int argc, const char* argv[]) {
-  benchmark::Initialize(&argc, argv);
-  benchmark::RunSpecifiedBenchmarks();
-  return 0;
-}
+BENCHMARK_MAIN();
 ```
 
 Sometimes a family of microbenchmarks can be implemented with