Update change log with new TextWidth option

Author: sds

CHANGELOG.md

@@ -5,6 +5,7 @@
 * Add `CargoTest` pre-push hook for running `cargo test`
 * Drop support for Ruby 2.1
 * Fix detection of `.git` directory location on Git < 2.5
+* Add `min_subject_width` option to `TextWidth` `commit-msg` hook
 
 ## 0.44.0