Updated front and rear cover, v2.2

In advance of the 4th printing of Runecairn: Core Rules, I’ve updated the front and rear cover. I’ve also made some corrections in the text.

Updated the PDF to v2.2:

• Updated front cover with new logo treatment and rear cover with new subtitle treatment
• Change swaying spear to mention lightning and remove giant
• Change double damage to damage advantage for parry in Equipment section
• Replace Pummel with Flurry in equipment skills