[git] add license to pre-commit hook script

.config/git/hooks/pre-commit

@@ -1,4 +1,10 @@
 #!/bin/bash
+# -----------------------------------------------------------------------------
+# "THE BEER-WARE LICENSE" (Revision 42):
+# <florianbadie@odrling.xyz> wrote this file. As long as you retain this notice
+# you can do whatever you want with this stuff. If we meet some day, and you
+# think this stuff is worth it, you can buy me a beer in return.   odrling
+# -----------------------------------------------------------------------------
 
 die() {
 	echo -e " ${NOCOLOR-\e[1;31m*\e[0m }${*}" >&2