Fix int64_t_t typo in README code example
Fixes a typo where the first type was written as int64_t_t with suffixing _t twice and the second type misses suffix at all.
diff --git a/README.md b/README.md
index 89cc507..525e83d 100644
--- a/README.md
+++ b/README.md
@@ -49,7 +49,7 @@
while (state.KeepRunning()) {
memcpy(dst, src, state.range_x());
benchmark::SetBenchmarkBytesProcessed(
- int64_t_t(state.iterations) * int64(state.range_x()));
+ int64_t(state.iterations) * int64_t(state.range_x()));
delete[] src;
delete[] dst;
}