missing pytest in setup

Author: FrancescoSaverioZuppichini

setup.py

@@ -18,7 +18,7 @@
     ],
     packages=find_packages(exclude=("tests",)),
     extras_require={
-        "dev": ["flake8", "black==22.3.0", "isort", "twine"],
+        "dev": ["flake8", "black==22.3.0", "isort", "twine", "pytest"],
     },
     classifiers=[
         "Programming Language :: Python :: 3",