Removing size param (not used anymore)

bip-0021.mediawiki

@@ -58,7 +58,6 @@ The scheme component ("bitcoin:") is case-insensitive, and implementations must
 *label: Label for that address (e.g. name of receiver)
 *address: bitcoin address
 *message: message that describes the transaction to the user ([[#Examples|see examples below]])
-*size: amount of base bitcoin units ([[#Transfer amount/size|see below]])
 *(others): optional, for future extensions
 
 ==== Transfer amount/size ====