Feature/version settle

[kernalphage]

Oooh we should steal this checklist.

But yeah. Updating the version numbers without changing anything so 4.1.0 is latest and stable.

descriptive title

• This PR only introduces changes to documentation.
  • Please include a summary of changes and an explanation
• This PR adds new functionality
  • Is there a related issue?
    • Please note the related issue below, and how this PR relates to the issue if appropriate
  • Does the code style reasonably match the existing code?
  • Are the changes tested (using the existing format, as far as is possible?)
  • Are the changes documented in the readme with a suitable example?
  • Is the table of contents updated?
• This PR introduces some other kind of change
  • Please explain the change below