List two changes made by recently accepted PRs from Variation. Since
those changes alter behaviour of existing endpoints, bump the e95 REST
API version number from 8.1 to 9.0.

Change-log.md

@@ -2,10 +2,14 @@
 
 Please note all dates are expressed as [ISO-8601](http://en.wikipedia.org/wiki/ISO_8601).
 
-# 8.1 - 2018-12
+# 9.0 - 2018-12
 ## New features
 * `[/stats]` Display basic server statistics
 
+## Updated endpoints
+* `[/variation/:species/:id?pops=1]` for population allele frequencies with no allele count, the allele_count property is not returned instead of incorrectly returning 0
+* `[/vep/:species]` remove documentation of CSN option due to relevant plug-in having been removed
+
 ## Bugfixes
 * cpanfile now includes Perl modules required to correctly render all error messages
 * fixed broken URL pointing to the Ensembl Variation documentation