Update following feedback, v1.2

Updated following feedback. Thanks, JasonT!

I’ve also added a free text only version of the monsters, since they’re released under a CC BY-SA licence.

Howl v1.2

• Added more guidance around the Tale of the Barghest.
• Added option for PCs to fight a hidden enemy at the end.
• Added new section at the beginning called The Next Adventure.
• Tweaked Wrapping Up section to tease next part of the adventure.
• Added Inspiration section to title page.
• Added barcode to rear cover.