custom/example: `shellcheck`

c

clean_files.txt

@@ -17,6 +17,7 @@
 # root directories
 #
 aliases/
+custom/
 docs/
 hooks/
 lib/

custom/example.bash

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+# shellcheck shell=bash
 #
 # This is an example file. Don't use this for your custom scripts. Instead, create another file within the
 # custom directory.