Add a link to my Github Sponsors profile #999

Job	Run time
Run linters (flake8)	1m 34s
Run linters (pydocstyle)	1m 31s
Run tests with coverage	1m 54s
Run linters (mypy)	1m 35s
Run tests on legacy versions (2.7)	5s
Run tests (3.8)	1m 19s
Run linters (pylint)	1m 38s
Run tests on legacy versions (3.5)	7s
Run tests (3.9)	1m 15s
Run tests on legacy versions (3.6)	1s
Run tests (3.10)	1m 8s
Run tests on legacy versions (3.7)	1s
Run tests on legacy versions (pypy2.7)	1s
Run tests (3.11)	1m 24s
Run tests on legacy versions (pypy3.9)	1s
	13m 34s

Provide feedback