Fix README.md
Closes
@@ -261,9 +261,9 @@ a single call to `read(2)`):
redisReply *reply;
redisAppendCommand(context,"SET foo bar");
redisAppendCommand(context,"GET foo");
-redisGetReply(context,(void *)&reply); // reply for SET
+redisGetReply(context,(void**)&reply); // reply for SET
freeReplyObject(reply);
-redisGetReply(context,(void *)&reply); // reply for GET
+redisGetReply(context,(void**)&reply); // reply for GET
freeReplyObject(reply);
```
This API can also be used to implement a blocking subscriber:
