Fix attribute error in setup.py #132

Job	Run time
Build wheels on windows-2019 AMD64	2m 11s
Build wheels on windows-2019 AMD64	2m 11s
Build wheels on windows-2019 x86	2m 16s
Build wheels on windows-2019 x86	2m 16s
Build wheels on ubuntu-20.04 x86_64	2m 23s
Build wheels on ubuntu-20.04 x86_64	2m 23s
Build wheels on ubuntu-20.04 aarch64	2m 22s
Build wheels on ubuntu-20.04 aarch64	2m 22s
Build wheels on ubuntu-20.04 i686	2m 22s
Build wheels on ubuntu-20.04 i686	2m 22s
Build wheels on macos-latest x86_64	2m 4s
Build wheels on macos-latest x86_64	2m 4s
Build wheels on macos-latest arm64	2m 23s
Build wheels on macos-latest arm64	3m 14s
Publish wheels to PyPI	0s
Publish wheels to PyPI	0s
	32m 53s

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