Dropped python 2 support for building the package. Still can be insta…

…lled to python2 though.

setup.py

@@ -1,13 +1,13 @@
 #!/usr/bin/env python3
-from os.path import join as pjoin, dirname
+from pathlib import Path
 
 from setuptools import setup
 from setuptools.config import read_configuration
 import setuptools_scm
 
 if __name__ == "__main__":
-    p = dirname(__file__)
-    setup_dict = read_configuration(pjoin(p, "setup.cfg"))
+    p = Path(__file__).parent
+    setup_dict = read_configuration(str(p / "setup.cfg"))
     v = setuptools_scm.version_from_scm(str(p))
     __version__ = setuptools_scm.format_version(
         v,