Updated setup

Author: WillAyd

setup.py

@@ -445,7 +445,7 @@ def get_tag(self):
 # Note: if not using `cythonize`, coverage can be enabled by
 # pinning `ext.cython_directives = directives` to each ext in extensions.
 # github.com/cython/cython/wiki/enhancements-compilerdirectives#in-setuppy
-directives = {'linetrace': False}
+directives = {'linetrace': False, 'language_level': 3}
 macros = []
 if linetrace:
     # https://pypkg.com/pypi/pytest-cython/f/tests/example-project/setup.py