Request for Proofreader membership

Please add the following volunteers to the @python GitHub org and the proofreaders team.
This team has no special privileges, it exists so it can be mentioned for help with wordsmithing. More info: https://discuss.python.org/t/16319

Volunteers to add:

• @mwichmann (Mats Wichmann)
• @bskinn (Brian Skinn)