Bug#1020649: New minisign public key for 0ad

[David W. Kennedy]

Via email from Stan: upstream changed their minisign public key for 
verifying the integrity of alpha 0.0.26 and beyond. Stan said that he is 
the controller of the minisign key for 0 A.D.

Instructions, and the updated minisign public key, are at the following 
website.

https://trac.wildfiregames.com/wiki/VerifyingYourDownloads

--
Dave Kennedy