polyglossia: Please add `Changelog.tex` to documentation

[Arthur Rosendahl]

On Wed, Feb 24, 2021 at 09:37:30AM +0100, Werner LEMBERG wrote:
> Running
> 
>   xelatex polyglossia.dtx 
> 
> also produces a file `Changelog.tex`.  I suggest to rename this to
> `Changelog` (or `ChangeLog`; it is a plain-text file) and put it into
> polyglossia's `doc` folder.

  Thanks for the report, I’ve opened an issue on GitHub:
https://github.com/reutenauer/polyglossia/issues/476/.  Let’s have the
discussion there.

	Best,

		Arthur