Broken CI
The package `codecov` was removed from PyPI, causing all our tests to fail. See https://about.codecov.io/blog/message-regarding-the-pypi-package/.
diff --git a/setup.py b/setup.py
index 8105c94..18d5003 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,6 @@ setup(
 	extras_require={
 		"dev": [
 			"pytest",
-			"codecov",
 			"coverage",
 			"mpmath",
 			"dill",
['setup.py']