Please create a changelog file

[mika76]

As per https://code.visualstudio.com/api/working-with-extensions/publishing-extension#marketplace-integration a CHANGELOG.md file would be automatically used as the changelog on the extensions page.

It's very useful - I never update an extension until I know what is being changed, and with your extensions I alway shave to manually go to github and read the commits. It would be much easier with a changelog file.

An option would be to use https://github.com/lob/generate-changelog (or something like it) to make it easier?