Fixes #165: CustomArguments ret type in README

AUTHORS

@@ -27,3 +27,4 @@ Shuo Chen <chenshuo@chenshuo.com>
 Yusuke Suzuki <utatane.tea@gmail.com>
 Dirac Research 
 Zbigniew Skowron <zbychs@gmail.com>
+Dominik Czarnota <dominik.b.czarnota@gmail.com>

CONTRIBUTORS

@@ -43,3 +43,4 @@ Shuo Chen <chenshuo@chenshuo.com>
 Yusuke Suzuki <utatane.tea@gmail.com>
 Tobias Ulvgård <tobias.ulvgard@dirac.se>
 Zbigniew Skowron <zbychs@gmail.com>
+Dominik Czarnota <dominik.b.czarnota@gmail.com>

README.md

@@ -104,12 +104,10 @@ The following example enumerates a dense range on one parameter,
 and a sparse range on the second.
 
 ```c++
-static benchmark::internal::Benchmark* CustomArguments(
-    benchmark::internal::Benchmark* b) {
+static void CustomArguments(benchmark::internal::Benchmark* b) {
   for (int i = 0; i <= 10; ++i)
     for (int j = 32; j <= 1024*1024; j *= 8)
-      b = b->ArgPair(i, j);
-  return b;
+      b->ArgPair(i, j);
 }
 BENCHMARK(BM_SetInsert)->Apply(CustomArguments);
 ```