docs(README.md): fix typo (#1217)

README.md

@@ -413,7 +413,7 @@ to all the keys in a command, which makes it easier to manage your key
 namespaces.
 
 **Warning** This feature won't apply to commands like [KEYS](http://redis.io/commands/KEYS) and [SCAN](http://redis.io/commands/scan) that take patterns rather than actual keys([#239](https://github.com/luin/ioredis/issues/239)),
-and this feature also won't apply to the replies of commands even they are key names ([#325](https://github.com/luin/ioredis/issues/325)).
+and this feature also won't apply to the replies of commands even if they are key names ([#325](https://github.com/luin/ioredis/issues/325)).
 
 ```javascript
 const fooRedis = new Redis({ keyPrefix: "foo:" });