Update cipher list

http://blog.cloudflare.com/killing-rc4-the-long-goodbye
REMOVED don't read CHECKS from project directory
ADDED support Host header

You can now check a URL with specific Host header, using a relative URL
of the form:

//example.com/about.html
ADDED wait before terminating old container

Give old container 5 seconds to finish processing in-flight requests

Configured with DOKKU_WAIT_TO_RETIRE
Added spaces in checks output
Merge remote-tracking branch 'main-upstream/master' into mh-sync-upstream
Merge remote-tracking branch 'upstream/master' into mh-sync-upstream
Merge pull request #1 from expa/mh-sync-upstream

Mh sync upstream