Fix the url in the "build" badge in the readme (#197)

See
#194 (comment)

Test the correct url [here on my
fork](https://github.com/jagerber48/uncertainties/tree/bugfix/build_badge_url).

README.rst

@@ -11,9 +11,7 @@ uncertainties
 .. image:: https://codecov.io/gh/lebigot/uncertainties/branch/master/graph/badge.svg
  :target: https://codecov.io/gh/lebigot/uncertainties/
 .. image:: https://img.shields.io/github/actions/workflow/status/lmfit/uncertainties/python-package.yml?logo=github%20actions
- :target: https://github.com/lmfit/uncertainties/blob/main/.github/workflows/python-package.yml
-
-**Call for maintainers**: if you want this project to keep living and are ready to maintain it (pull requests management, issue resolution…), please contact me! I am ready to share my knowledge of the code logic by participating in discussions (notably around pull requests and issues).
+ :target: https://github.com/lmfit/uncertainties/actions/workflows/python-package.yml
 
 This is the ``uncertainties`` Python package, which performs **transparent
 calculations with uncertainties** (aka "error propagation"):