feat: use /usr/bin/env sh instead of direct path of sh (#1051)

.husky/commit-msg

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 . "$(dirname "$0")/_/husky.sh"
 
 npx --no-install commitlint --edit "$1"

.husky/pre-commit

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 . "$(dirname "$0")/_/husky.sh"
 
 npm test

docs/README.md

@@ -399,7 +399,7 @@ fi
 2. Source it in in places where Yarn is used to run commands:
 
 ```shell
-#!/bin/sh
+#!/usr/bin/env sh
 . "$(dirname "$0")/_/husky.sh"
 . "$(dirname "$0")/common.sh"
 

husky.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env sh
 if [ -z "$husky_skip_init" ]; then
   debug () {
     if [ "$HUSKY_DEBUG" = "1" ]; then

src/index.ts

@@ -63,7 +63,7 @@ export function set(file: string, cmd: string): void {
 
   fs.writeFileSync(
     file,
-    `#!/bin/sh
+    `#!/usr/bin/env sh
 . "$(dirname "$0")/_/husky.sh"
 
 ${cmd}