Merge pull request #29 from glydways/non-fhs

`hooks/`: Use `/usr/bin/env` for shell directive instead of hard-coded paths

Author: mcncl

hooks/checkout

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -euo pipefail
 

hooks/environment

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e