Updated rate limit statuscode

[mvdwetering]

On the Hue developer website there is a message about the rate limiting status code being updated https://developers.meethue.com/rate-limiting-status-code/

Quoted below for convenience

Dear developers,

The next Hue Bridge firmware release contains a change to the HTTP status code we respond with when your client exceeds the request rate limit. Previously this would return the wrong status code 503, and going forward the correct status code will be 429.

This only applies to HTTPS connections. The 503 status code can still happen, but only if the service you try to communicate with is temporarily unavailable (i.e. server side issue), whereas 429 will happen if your application is making to many requests in a short period of time (i.e. client side issue).

Hue Developer Support

Since there is no specific bridge version mentioned I just added the 429 code same as 503 was done. This allows to work with bridges still on "before" versions and my assumption is that backing off when the service is temporarily unvailable is not a big issue.

[marcelveldt]

besides the small comment this is nice, thanks!

[mvdwetering]

I moved the comments

[marcelveldt]

Thanks!