Fix typo in pyelliptic.hash

src/pyelliptic/hash.py

@@ -35,7 +35,7 @@ def equals(a, b):
 
 def hmac_sha256(k, m):
     """
-    Compute the key and the message with HMAC SHA5256
+    Compute the key and the message with HMAC SHA256
     """
     key = OpenSSL.malloc(k, len(k))
     d = OpenSSL.malloc(m, len(m))