Small text change on getkirby.com

To the maintainers of getkirby.com:

Open this
https://getkirby.com/docs/developer-guide/security
and search for the string “available in November 2015”.

I suppose it has to be changed in “available since November 2015”

Thanks, just fixed it. Should be live on the site with the next deployment.

PS: Please report issues with the site at the getkirby.com repo in the future.