Update readme with number of implemented cards.

readme.md

@@ -2,7 +2,7 @@
 
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-XMage allows you to play Magic against one or more online players or computer opponents. It includes full rules enforcement for over **16950** unique cards (over 32800 counting all cards from different editions). Starting with *Morningtide*, all regular sets have nearly all the cards implemented.
+XMage allows you to play Magic against one or more online players or computer opponents. It includes full rules enforcement for over **17.200** unique cards (over 33.100 counting all cards from different editions). Starting with *Morningtide*, all regular sets have nearly all the cards implemented.
 
 There are public servers where you can play XMage against other players. You can also host your own server to play against the AI and/or your friends.