Update changelog

CHANGELOG.md

@@ -4,6 +4,14 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [v0.8.0]
+### Added
+- `--combine` option to combine calls from all modified bases in a family.
+  The previous behaviour was that the non-modified (canonical) count would
+  have be incremented. For example when searching for 5mC modifications
+  with `-m 5mC` and a 5hmC base was present, the read would contribute
+  to the canonical count, not the modified count.
+
 ## [v0.7.0]
 ### Added
 - `--pileup` option to output full raw base counts rather than BED methyl.