Update changelog

Change-Id: I788dae1282c7d20344c92bca8c57bbc957f76d4e
Reviewed-on: http://gerrit.causes.com/41072
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>

Author: sds

CHANGELOG.md

@@ -1,5 +1,11 @@
 # SCSS-Lint Changelog
 
+## master (unreleased)
+
+* Fix `TrailingSemicolon` bug with `@include` blocks that didn't contain
+  properties
+* Add more properties to `concentric` preset order
+
 ## 0.26.1
 
 * Fix `TrailingSemicolon` incorrectly reporting `@include`s with block contents