Update EIP-6188: Fix typo

Merged by EIP-Bot.

Author: Pandapip1

EIPS/eip-6188.md

@@ -37,7 +37,7 @@ Capping a nonce allows for contracts with special properties to be created, with
 
 ## Backwards Compatibility
 
-This EIP requires a protocol upgrade, since it modifies consensus rules. The further restriction of nonce should not have an effect on accounts, as reaching a nonce of `2^64-2` is unfeasible.
+This EIP requires a protocol upgrade, since it modifies consensus rules. The further restriction of nonce should not have an effect on accounts, as reaching a nonce of `2^64-2` is difficult.
 
 ## Security Considerations