update readme

README.rst

@@ -215,7 +215,7 @@ digest
 
 ::
 
-	new OBJ = digest(ENUM {CRC32,MD5,SHA1,SHA224,SHA256,SHA384,SHA512,SHA3_224,SHA3_256,SHA3_384,SHA3_512} hash, BLOB init=0, ENUM {TASK,TOP} scope="TASK")
+	new OBJ = digest(ENUM {CRC32,MD5,SHA1,SHA224,SHA256,SHA384,SHA512,SHA3_224,SHA3_256,SHA3_384,SHA3_512} hash, BLOB init=0, ENUM {TASK,TOP} scope=TASK)
 
 Initialize a message digest context for the algorithm ``hash``, and
 optionally update it with ``init``. If ``init`` is left out, then an