Fixes #165: CustomArguments ret type in README

* adds myself to AUTHORS/CONTRIBUTORS
diff --git a/AUTHORS b/AUTHORS
index efb854a..5a4b355 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -27,3 +27,4 @@
 Yusuke Suzuki <utatane.tea@gmail.com>
 Dirac Research 
 Zbigniew Skowron <zbychs@gmail.com>
+Dominik Czarnota <dominik.b.czarnota@gmail.com>
diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 077e55e..ed55bcf 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -43,3 +43,4 @@
 Yusuke Suzuki <utatane.tea@gmail.com>
 Tobias Ulvgård <tobias.ulvgard@dirac.se>
 Zbigniew Skowron <zbychs@gmail.com>
+Dominik Czarnota <dominik.b.czarnota@gmail.com>
diff --git a/README.md b/README.md
index 83d1b81..8c656ea 100644
--- a/README.md
+++ b/README.md
@@ -104,12 +104,10 @@
 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);
 ```