Update run.rb
Update run.rb

Changed RENEWAL_DELTA to 30 days per LetsEncrypt's recommendation:

We recommend renewing certificates automatically when they have a third of their
total lifetime left. For Let's Encrypt's current 90-day certificates, that means
renewing 30 days before expiration.
will-in-wi/letsencrypt-webfaction,will-in-wi/letsencrypt-webfaction