Fix the username of @pizza-r0b in EIP-2309 (ethereum#2389)

Author: axic

EIPS/eip-2309.md

@@ -1,7 +1,7 @@
 ---
 eip: 2309
 title: ERC-721 Consecutive Transfer Extension
-author: Sean Papanikolas (@pizza_r0b)
+author: Sean Papanikolas (@pizza-r0b)
 discussions-to: https://github.com/ethereum/EIPs/issues/2309
 status: Draft
 type: Standards Track