use bash instead of sh in http_simple_bench.sh

diff --git a/benchmark/http_simple_bench.sh b/benchmark/http_simple_bench.sh
index 79cbaa7..6ba8e06 100755 (executable)
--- a/benchmark/http_simple_bench.sh
+++ b/benchmark/http_simple_bench.sh
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 SERVER=127.0.0.1
 PORT=8000