Fix change description.
* The `MDCertificateAuthority` directive can take more than one URL/name of
an ACME CA. This gives a failover for renewals when 2 consecutive attempts
to get a certificate failed. See REAME for details.
- * New directive `MDMinRetryDelay` to set the delay of retries. See README
+ * New directive `MDRetryDelay` to set the delay of retries. See README
+ for details.
+ * New directive `MDRetryFailover` to set the number of errored attempts
+ before an alternate CA is selected for certificate renewals. See README
for details.
v2.4.15
