Fixed dumb error in hash calculation

src/pearson.py

@@ -13,7 +13,7 @@ def hashN(message: str, nBytes: int) -> str:
     """
     retval=0
 
-    for j in range(nBytes-1):
+    for j in range(nBytes):
         #Change the first byte
         h = table[(ord(message[j]) + j) % 256];
         for i in message[1:]: