EIP-1240: Changes status to Withdrawn (ethereum#2828)

My stance on this has changed over the years since I created this EIP and while I still am not outright against this change, I better appreciate why the bomb exists and am no longer interested in fighting for its removal.  If someone else wants to take over this EIP let me know and we can change the author and move it back into DRAFT.

EIPS/eip-1240.md

@@ -5,7 +5,7 @@ author: Micah Zoltu (@MicahZoltu)
 discussions-to: https://ethereum-magicians.org/t/difficulty-bomb-removal/832
 type: Standards Track
 category: Core
-status: Draft
+status: Abandoned
 created: 2018-07-21
 ---