Update README.md

Fix typo

README.md

@@ -32,7 +32,7 @@ Guess times
 100 / h:		1 months 	(throttled online attack)
 10  / s:		3 hours  	(unthrottled online attack)
 10k / s:		11 seconds	(offline attack, slow hash, many cores)
-10b / s:		< 1 second	(offline attack, slow hash, many cores)
+10b / s:		< 1 second	(offline attack, fast hash, many cores)
 ```
 
 ```
@@ -46,7 +46,7 @@ Guess times
 100 / h:		Centuries	(throttled online attack)
 10  / s:		Centuries	(unthrottled online attack)
 10k / s:		3 years  	(offline attack, slow hash, many cores)
-10b / s:		2 minutes	(offline attack, slow hash, many cores)
+10b / s:		2 minutes	(offline attack, fast hash, many cores)
 
 This password has been compromised and should not be used.
 ```