Fix shebang content

https://github.com/v2fly/fhs-install-v2ray/commit/a24fe6823b02e2f1780e4d7845353bf84531e038

install-release.sh

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 # The files installed by the script conform to the Filesystem Hierarchy Standard:
 # https://wiki.linuxfoundation.org/lsb/fhs