common: Updated changelog

common/debian/changelog

+symbiosis-common (2015:1213) stable; urgency=medium
+
+  * Don't give duff emails (with newlines) to letsencrypt.
+  * More output is given when the letsencrypt verification step fails.
+  * The first named domain will be used as the CN now.
+  * Added --force flag to re-request certificates.
+
+ -- Patrick J Cherry <patrick@bytemark.co.uk>  Thu, 21 Jan 2016 12:03:30 +0000
+
 symbiosis-common (2015:1212) stable; urgency=medium
 
   * Only poll the LetsEncrypt servers whilst the certificate request is still