Fixes shebang

`bash` may be installed in a different location.

Mine:
> » which bash
> /usr/local/bin/bash

Author: sobolevn

bin

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #    _                                _
 #   | |                              | |
 #   | |__  _   _ _ __ ___  _ __   ___| |__