Upgrading sources

[PanderMusubi]

(Sort of note to myself) Please, use the following URLs for upgrading sources:

• Bootstrap and download the file bootstrap-5.y.z-dist.zip, unzip it and
  • overwrite flask_bootstrap/static/bootstrap5/js/bootstrap.min.js
  • overwrite flask_bootstrap/static/bootstrap5/js/bootstrap.min.js.map
  • overwrite flask_bootstrap/static/bootstrap5/css/bootstrap.min.css
  • overwrite flask_bootstrap/static/bootstrap5/css/bootstrap.min.css.map
  • upgrade in flask_bootstrap/__init__.py according to CDN
    • the value of bootstrap_version to 5.y.z
    • the value of bootstrap_css_integrity
    • the value of bootstrap_js_integrity (take extra care using proper value, details e.g. version 4 or bundle)
  • run pytest
  • run pip install .
  • run python3 examples/bootstrap5/app.py and test the examples in a browser
  • update CHANGES.rst (Note: only upgrade if there is also a new version of Bootswatch)
• Bootstrap Icons and download the file bootstrap-icons-x.y.z.zip, unzip it and
  • overwrite flask_bootstrap/static/bootstrap4/icons/bootstrap-icons.svg
  • overwrite flask_bootstrap/static/bootstrap5/icons/bootstrap-icons.svg
  • run python3 update-icons.py in examples/
  • run pytest
  • run pip install .
  • run python3 examples/bootstrap4/app.py and test the examples in a browser
  • run python3 examples/bootstrap5/app.py and test the examples in a browser
  • update CHANGES.rst
• Bootswatch and download the file Source code (zip), unzip it and TODO (this instruction will be completed upon next upgrade.)
  • remove the *rtl* and *.map files that are shipped with Bootswatch
  • run python3 list-bootswatch.py in examples/ and if needed update the related app.py files
  • run pytest
  • run pip install .
  • run python3 examples/bootstrap4/app.py and test the examples in a browser
  • run python3 examples/bootstrap5/app.py and test the examples in a browser
  • update CHANGES.rst
• Popper TODO needs to replaced with a new library

for code coverage, see also #276