docs: add sample changelog

readme.md

@@ -125,6 +125,29 @@ And [here](https://i.imgur.com/mQaiAuk.png) is colorful screenshot of `please` r
 And here is a preview of all [features](https://www.npmjs.com/package/@adhocore/devnull) of `please` in one [release](https://github.com/adhocore/dev-null/releases/tag/0.0.6):
 ![Full Preview](https://imgur.com/TXI6Jst.png "Full Feature Preview")
 
+### Sample changelog
+
+[CHANGELOG.md](./CHANGELOG.md) generated by `please` looks like:
+
+```
+## [0.0.1] 2018-01-01 00:00:00 UTC
+
+- commit 1
+- commit 2
+...
+```
+
+If you passed in `--chash` flag then:
+
+```
+## [0.0.1] 2018-01-01 00:00:00 UTC
+
+- [<commit1hash>](https://github.com/<repo>/commit/<commit1hash>) commit 1
+- [<commit2hash>](https://github.com/<repo>/commit/<commit2hash>) commit 2
+...
+```
+
+On subsequent releases new changes are prepended such that latest commits stay at top.
 
 ### Troubleshooting