Update trinket_m0_haxpress.md

Moved URL to next line with indented hyphen.

Author: Timeline8

_board/trinket_m0_haxpress.md

@@ -4,7 +4,8 @@ board_id: "trinket_m0_haxpress"
 title: "Trinket M0 Haxpress Download"
 name: "Trinket M0 Haxpress"
 manufacturer: "Dave Astels"
-board_url: https://web.archive.org/web/20210727135908/http://daveastels.com/trinket-m0-express-hack.html
+board_url: 
+  - https://web.archive.org/web/20210727135908/http://daveastels.com/trinket-m0-express-hack.html
 board_image: "trinket_m0_haxpress.jpg"
 date_added: 2019-03-19
 family: atmel-samd