CHANGELOG missing

[andreasabel]

Please add a changelog.

[freizl]

What you do with changelog?
Im trying to capture changes in the release notes.
https://github.com/freizl/hoauth2/releases

[andreasabel]

A changelog would summarize the important changes for the user of your library.
It would be more digested than the (semi-)auto-generated change listing, which e.g. contains entries like

• Data.Map is probably good enough for demo-app by @freizl in Data.Map is probably good enough for demo-app #229
• Refactor/update comments by @freizl in Refactor/update comments #225

As a user, I wouldn't know how to make sense of such entries, or wouldn't know why I should care.

There are plenty of examples for changelogs in the Haskell ecosystem.
It is helpful to put yourself into the perspective of a user: If you are using library L and it get's re-released, what changes would you like to be informed about.
I am usually interested in these questions:

1. What are the advantages of switching to the new version (gained features, performance, correctness etc.)?
2. What are the risks and costs of switching (API changes, incompatibilities, etc.)?