Update README.md to accurately describe silent error event (#1991)

* Update README.md to accurately describe silent `error` event

* Update README.md to add caveat of when `lazyConnect` is true

Author: loucadufault

README.md

@@ -826,7 +826,7 @@ The Redis instance will emit some events about the state of the connection to th
 | :----------- | :---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | connect      | emits when a connection is established to the Redis server.                                                                                                                                                                                     |
 | ready        | If `enableReadyCheck` is `true`, client will emit `ready` when the server reports that it is ready to receive commands (e.g. finish loading data from disk).<br>Otherwise, `ready` will be emitted immediately right after the `connect` event. |
-| error        | emits when an error occurs while connecting.<br>When `lazyConnect` is false, ioredis emits all `error` events silently (only emits when there's at least one listener) so that your application won't crash if you're not listening to the `error` event.<br> However when `lazyConnect` is true and `redis.connect()` is explicitly called it will return a promise which might reject with an error. If `redis.connect()` is not called explicitly, ioredis will try to connect automatically on the first command and emit the `error` event silently.                                                      |
+| error        | emits when an error occurs while connecting.<br>However, ioredis emits all `error` events silently (only emits when there's at least one listener) so that your application won't crash if you're not listening to the `error` event.<br>When `redis.connect()` is explicitly called the error will also be rejected from the returned promise, in addition to emitting it. If `redis.connect()` is not called explicitly and `lazyConnect` is true, ioredis will try to connect automatically on the first command and emit the `error` event silently.                                                      |
 | close        | emits when an established Redis server connection has closed.                                                                                                                                                                                   |
 | reconnecting | emits after `close` when a reconnection will be made. The argument of the event is the time (in ms) before reconnecting.                                                                                                                        |
 | end          | emits after `close` when no more reconnections will be made, or the connection is failed to establish.                                                                                                                                          |