* Bugfix of regex at FloatConvertor (version 2)
For passing your checks of https://github.com/encode/starlette/pull/1942
A correct statement is: regex = r"[0-9]+(\.[0-9]+)?"
Reference: https://www.flake8rules.com/rules/W605.html
I have no problem to corrected without 'r' prefix directly at /site-packages/starlette/convertors.py of my computer.
Having submitted last pull-request, I realized to add a 'r' prefix to pass your tests.
* Add test
Co-authored-by: Ching <thus.kindly@gmail.com>