update tolerance

src/error.rs

@@ -17,6 +17,8 @@ pub enum OreError {
     StakeTooLarge = 4,
     #[error("The clock time is invalid")]
     ClockInvalid = 5,
+    #[error("The tolerance cannot be negative")]
+    ToleranceNegative = 6,
 }
 
 impl From<OreError> for ProgramError {