Example does not compile

[DaimonPl]

Just wanted to try first example with head version of master branch (d750144):

error: cannot initialize a parameter of type 'const char **' with an lvalue of type 'char **'
benchmark::Initialize(&argc, argv);

Of course it can be easily fixed manually, but it's always better if example compiles :)

For reference I just copied example (and added proper include):

#include <string>
#include "benchmark/benchmark.h"

static void BM_StringCreation(benchmark::State& state) {
  while (state.KeepRunning())
    std::string empty_string;
}
// Register the function as a benchmark
BENCHMARK(BM_StringCreation);

// Define another benchmark
static void BM_StringCopy(benchmark::State& state) {
  std::string x = "hello";
  while (state.KeepRunning())
    std::string copy(x);
}
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, char** argv) {
  benchmark::Initialize(&argc, argv);
  benchmark::RunSpecifiedBenchmarks();
  return 0;
}