Bump pyusb from 1.2.0 to 1.2.1 (#75)

Bumps [pyusb](https://github.com/pyusb/pyusb) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/pyusb/pyusb/releases)
- [Commits](https://github.com/pyusb/pyusb/compare/v1.2.0...v1.2.1)

---
updated-dependencies:
- dependency-name: pyusb
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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setup.py

@@ -59,7 +59,7 @@ if __name__ == "__main__":
             "pyflakes==2.3.1",
             "Pygments==2.9.0",
             "pyrsistent==0.18.0",
-            "pyusb==1.2.0",
+            "pyusb==1.2.1",
             "setuptools>=45",
             "six==1.16.0",
             "spinners==0.0.24",