Fix the problem with the setup.py and setuptools

See pypa/setuptools#2029

setup.py

@@ -10,7 +10,6 @@ def get_readme():
     return content
 
 
-SETUP_REQUIRES = ["setuptools~=46.0.0"]
 TEST_REQUIRES = ["pytest-cov"]
 VERSION = "0.4.2"
 NAME = "antidot-html-connector"
@@ -38,9 +37,8 @@ def get_readme():
     packages=setuptools.find_namespace_packages(),
     package_dir={},
     install_requires=["beautifulsoup4", "fluidtopics>=0.2.0"],
-    setup_requires=SETUP_REQUIRES,
     tests_require=TEST_REQUIRES,
-    extras_require={"test": TEST_REQUIRES, "setup": SETUP_REQUIRES},
+    extras_require={"test": TEST_REQUIRES},
     url="https://scm.mrs.antidot.net/antidot/html-connector",
     zip_safe=True,
 )