Merge pull request #15 from vgvassilev/fix-loader-upstream #20

Job	Run time
build-aarch64-wheels	8s
Build source distribution	25s
Build wheels on cp36-macosx_x86_64	1h 16m 50s
Build wheels on cp38-macosx_arm64	1h 14m 30s
Build wheels on pp37-macosx_x86_64	1h 20m 3s
Build wheels on cp36-manylinux_x86_64	1h 22m 26s
Build wheels on cp36-manylinux_i686	1h 31m 38s
Build wheels on pp37-manylinux_x86_64	1h 16m 56s
Build wheels on cp36-win32	2h 0m 35s
Build wheels on cp36-win_amd64	2h 9m 51s
Build wheels on cp39-win_arm64	2h 12m 54s
upload_aarch64_wheel	9s
	14h 26m 25s

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