Fix tests package name when excluding it

Author: AMDmi3

setup.py

@@ -24,7 +24,7 @@
     url="http://github.com/pudo/normality",
     license="MIT",
     package_data={"banal": ["py.typed"]},
-    packages=find_packages(exclude=["ez_setup", "examples", "test"]),
+    packages=find_packages(exclude=["ez_setup", "examples", "tests"]),
     namespace_packages=[],
     include_package_data=True,
     zip_safe=False,