Switch to LGPL #80

Job	Run time
Build source distribution	16s
Build wheels on windows-2019 x64	13m 45s
Build wheels on windows-2019 x86	9m 20s
Build wheels on windows-2019 arm64	8m 47s
Build wheels on macos-11 x64	11m 18s
Build wheels on macos-11 universal2	7m 54s
Build wheels on macos-11 arm64	7m 1s
Build wheels on ubuntu-20.04 x64	11m 44s
Build wheels on ubuntu-20.04 x86	9m 52s
Build wheels on ubuntu-20.04 arm64	1h 42m 54s
Build wheels on ubuntu-20.04 ppc64le	1h 11m 41s
Build wheels on ubuntu-20.04 s390x	1h 11m 0s
upload_pypi_test	1m 8s
upload_pypi	0s
	5h 26m 40s

Provide feedback